3rd Generation Tips and Tricks Ruby and SapphireRare BerriesWithin the R/S games, there are numerous hidden Berries. Below is a list of the locations of some of them. Talk to the Berry Master's wife and tell her what she wants to hear:
You can use these Berries to make Pokéblock. Pokéblock made from Pamtre Berries specifically can help you evolve Feebas into Milotic. Mirage IslandOne of the most rare things in the games, Mirage Island is a small island that will appear randomly appear on Route 130. Every day, the game generates a random number. If this number matches the Personality Value of one of your party's Pokémon, Mirage Island will appear (note that a Pokémon's Personality Value is a hidden value created by the game once you catch or receive a Pokémon). Inside Mirage Island are wild Wynaut ranging from level 5 to level 50. The real selling point of Mirage Island, however, is that it is the only place were you can get a Liechi Berry, one of the most rare Berries in the game. A man in Pacifidlog Town will tell you if Mirage Island is there or not. 
SmeargleSee the Emerald Tips section below for information about this Pokémon. FireRed / LeafGreen TipsCapturing the Legendary DogsIn FireRed and LeafGreen, after defeating the Elite Four, one of the Legendary beasts will be roaming around Kanto. Depending on your starter, only one of the beasts can be found.
Prerequisites
Method
Route 2 is just an example. Any place with somewhere you can "refresh" the location of the roamer, such as Diglett's Cave in Vermillion, would be OK. 
Note: Both Entei and Raikou can use Roar. As such, unless you have a Master Ball, you might want to both trap them and use a move such as Ingrain. The only Pokémon that can learn this combination in the game is Smeargle, which should be traded from R/S/E. Other Pokémon worth mentioning are Pokémon with the Soundproof ability, such as Mr. Mime, which are not affected by moves like Roar. Obtaining Repeat and Timer Balls in KantoRepeat and Timer Balls cannot be found in any Kanto Poké Mart, but they are sold by a man on Two Island after meeting certain conditions. First, deliver Celio's Meteorite to the man at Two Island's Game Corner; this man wants you to find his lost daughter, Lostelle. Lostelle is located on Three Island, in the Berry Forest. To get to the Berry Forest, defeat the biker gang, then head over Bond Bridge. Save Lostelle by battling the Hypno that is harassing her, and you will be taken back to Two Island. The second half of the requirements must be fulfilled after defeating the Elite Four at least once. Return to Boon Island, then buy at least one of each of the items carried by the man. Enter and exit a building, then return to see what items he has for sale. Repeat and Timer Balls should now be in stock. Learning the "Ultimate Move"After beating the Elite Four, head to Cape Brink (which is located on Two Island). You will find a house with a lone woman looking for someone who can learn her "Ultimate Move". If you have your starter with you (in your party's lead), she will teach it a special move. Venusaur will learn Frenzy Plant, Blastoise will learn Hydro Cannon, and Charizard will learn Blast Burn. 
Togepi EggAfter beating the Elite Four and unlocking the Sevii Islands, head to Island 5. Once there, Surf west, until you find a water path. Keep heading west, and eventually you'll find a small piece of land with an old man there. Talk to him, and if the first Pokémon in your Party has high happiness, he'll give you a Togepi Egg. 
Getting Quick CashLocated in Island 5 are a couple of trainers that you can rebattle using the Vs. Seeker to get quick cash. To get to them, go to Island 5, then head north until you reach Resort Gorgeous. In there you will find two rich trainers each giving about 10000 Pokedollars. If you use an Amulet Coin and battle both of them, you can get about 40000 Pokedollars. Of course, you can repeat this process as much as you want, thanks to the Vs. Seeker. Colosseum / XD TipsColosseum Master Ball GlitchThis is a simple glitch that can be used to 'clone' an almost unlimited amount of any type of Poké Ball. Performing it is very simple:
Note:It has been said that sometimes, when performing this glitch using a Master Ball, the game will freeze. This shouldn't be dangerous, though. Please also note that this glitch does not work on XD. Shadow PokémonShadow Pokémon are different from normal Pokémon in several ways, including:
XD EVing GroundsThe following is a helpful list of trainers you can battle in the Mt. Battle of Pokémon XD to gain EVs in a specific stat. Every trainer gives some EVs in only one stat. HP
ATTACK
DEFENSE
SPEED
SPECIAL ATTACK
SPECIAL DEFENSE
Emerald TipsSmeargleThe BreederThe 'Ultimate Egg Move Parent', Smeargle, is without doubt the best Pokémon for breeding Egg moves onto new Pokémon. Smeargle is part of the Ground Egg group, the largest of all the Egg groups. Smeargle also has the ability to learn every move in the game, via it's signature move Sketch. Often, a combination of Egg moves is only possible with the use of a Smeargle as the male parent. Thus, next to Ditto, Smeargle is the second most important breeding tool within the game. It is a must have for any competitive breeder. The Catcher
Smeargle @ Leftovers Level: 100 Ability: Own Tempo Jolly / Adamant, 252 HP / 252 Atk ~ Spore ~ False Swipe ~ Mean Look / Foresight / Thunder Wave / Sweet Scent ~ Haze / Foresight / Thunder Wave / Sweet Scent Spore and False Swipe are a given. A Pokémon that is at 1 HP and asleep has the highest chance of being caught, only further increased by choice of Poké Ball used. By using Smeargle, you gain STAB on False Swipe. Mean Look prevents roaming Pokémon such as the Lati twins from escaping the battle. Foresight is useful for allowing False Swipe to work on Ghost-type Pokémon. Thunder Wave is a usable alternative to Spore on Pokémon with the Insomnia ability. Haze is useful for stat-uppers, but your own stat boosting move such as Swords Dance can be used for upping the power of False Swipe. Recover or Refresh are also viable but lesser options, as you have access to recovery items, status healers and the X items. Sweet Scent is an option if you do not wish to have a separate Pokémon in your party with the move. When it comes to Smeargle's EVs, a level 100 Smeargle with a 20 Speed IV or higher doesn't need any Speed EVs, so they are all pumped into HP and Attack for survivability and maximum power. The reason for this is because the fastest wild Pokémon in the game, Rayquaza at Spear Pillar, is outsped by a level 100 Smeargle with a minimum of 20 Speed IVs and 0 Speed EVs. The Battle Frontier IV ManIn Emeralds Pokémon Frontier, there's a guy in a house just above the Pokémon Center that will give you information about your Pokémon's IVs. This man is very handy when you want to check if your Pokémon has any flawless IVs. Once you speak to him, he'll start judging your Pokémon's "abilities". "Ah, youngster! Do your Pokémon's abilities intrigue you? Here, here! Let's have a look at your Pokémon!" Choose the Pokémon you want checked. He will then say: "...Hmm...This one, overall, ..."
Then the man will then proceed to mention the best IV that Pokémon possesses. If it has more than one best IV, he will randomly pick a stat every time you talk to him. "Incidentally, the best aspect of it, I would say, is its (HP / ATTACK / DEFENSE / SPECIAL ATTACK / SPECIAL DEFENSE / SPEED) ..." He then gives a judgment about that IV alone:
The man will then finish up his monologue with the words: "...Hm... That's how I call it." 
The Synchronize and Flame Body AbilitiesIn Emerald, the Synchronize and Flame Body abilities were given an outside-of-battle effect, unlike most others. If you're breeding or capturing specific-natured Pokémon, then these abilities will be handy.
Here is a list of Pokémon with Flame Body / Magma Armor abilities:
Unlocking Repeat and Timer BallsAfter clearing the Rusturf Tunnel with Rock Smash, speak to the Devon corporation Employee on the Rustboro Side exit; he will give you one of the balls, and inform you that the Rustboro Pokémart will sell both the Timer and Repeat Balls. Getting the Johto StartersIf you complete the 200 Pokémon of the Hoenn Pokedex (excluding Deoxys and Jirachi), Professor Birch will contact you. If you visit him, he'll allow you to choose one of the Johto Starters (either Chikorita, Totodile, or Cyndaquil). The Battle Tower Cloning GlitchThis glitch is easily one of the best glitches any of the Pokémon games has ever had. It can be used to clone up to 6 Pokémon at a time and a huge number of items at once. To attempt this glitch you have to first beat the Elite Four and unlock the Battle Frontier. Once there, head to the Battle Tower, and follow the following steps:
Caution: While performing step 4, do not deposit anything to the PC. Anything deposited will be permanently deleted. If you want to deposit anything, do that and then save the game again. Mirage IslandMirage Island appears in Emerald the same way it appears in R/S, as explained in the Ruby/Sapphire Tips section above. Pokémon NewsOccasionally, there will be news reports airing on TVs around Hoenn. Some of these news reports are helpful, and you should be aware of them.
There are other Pokémon News reports that happen throughout Hoenn, but most of them are generally unimportant. The Effort RibbonIn Slateport City, there is a woman who will check the first Pokémon of your party. If it has max EVs (510), she will give it the Effort Ribbon. This is really helpful when you want to check if you're done EV training a specific Pokémon. 
Getting the Amulet CoinAfter getting the fifth badge, head back to your home. Speak to your mother, and she will give you an Amulet Coin. This item doubles the amount of money you get from a battle if the Pokémon holding this item participates in the battle. Invisible Kecleon LocationsAround Routes 119 and 120, six hidden Kecleon can be found using the Devon Scope. Below are the locations of all of them.
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