Figured I would do this now, since I'm wrapping up the rest of the analysis this weekend
[OTHER OPTIONS]
Forretress makes pretty good use of Pain Split to gain recovery from a healthier Pokémon and boost its longevity and use in a game. however, it is unreliable at that role, and using it makes Forretress unable to either hit Dragonite or Terrakion and Kyurem-Black. Other Utility moves like Stealth Rock and Toxic Spikes are nice to further chip away at teams that are unprepared, but Forretress cannot keep stealth rocks up reliably, and Toxic spikes are useless against Poison and levitators. Toxic is also a good option to Hit Gastrodon and Jellicent, the ladder being able to stop Forretress from keeping hazards off, but it doesn't hit a lot of other targets, and is useless versus many common threats on sand teams, including Clefable, Reuniclus, and Gliscor. additionally, many pokemon run lum berry, such as Dragonite and Volcarona. Hidden Power Fire is an excellent lure for Scizor and Ferrothorn, but otherwise has poor coverage and damage output, making forretress useless versus Keldeo and Substitute Kyurem-Black. Volt switch provides good momentum, but it doesnt help versus ground types, and means that Forretress will more often switch out then in, making it a lot more passive. Explosion also enables offensive teams when paired with sturdy, but many of the common pokemon in the tier, such as Tyranitar, Ferrothorn, and Landorus-Therian, can shrug it off with relative ease. Counter is also a nice option to stop Dragonite with multiple boosts and can use its bulk to pick off common pokemon like Landorus-Therian and Excadrill, but it otherwise has no utility aside from that, and is useless versus mixed attackers as they will target its weaker special defense.
[CHECKS AND COUNTERS]
Trappers: Magnezone can remove Forretress without much issue, and Heatran can bypass sturdy with Magma Storm, and set up rocks once it's gone.
Set up sweepers: Volcarona and Reuniclus can tank most of what forretress can do, and set up Quiver dances and Calm minds to steamroll the rest of its team. Dragonite can set up on Forretress lacking Hidden power ice, and Scizor can stack Swords dance boosts on Forretress lacking Hidden Power Fire.
Hazards and Ghost types: Hazards limit how many times Forretress can switch in, and will decrease its ability to tank hits. Jellicent can wall whatever Forretress tries to do, and can burn it with Will-O-Wisp, or prevent it from setting hazards with Taunt.
Strong special attackers: Choice Specs Latios can chip down forretress over the course of the game, and Keldeo can offload devastating Choice Specs boosted hydro pumps for free, or set up with Calm mind. Alakazam with Hidden Power fire also scare away Forretress, however it can take non-hidden power Alakazam.
Bulky walls: Clefable can knock off valuable leftovers from Forretress, and can paralyze it with thunder wave, making it very easy to play around. Blissey can do the same, except it can support its teammates with wish too. Ferrothorn can get hazards for free against non Hidden Power Fire Forretress, and can make it very hard for it to find chances to spin later in the game.
Forretress makes pretty good use of Pain Split to gain recovery from a healthier Pokémon and boost its longevity and use in a game. however, it is unreliable at that role, and using it makes Forretress unable to either hit Dragonite or Terrakion and Kyurem-Black. Other Utility moves like Stealth Rock and Toxic Spikes are nice to further chip away at teams that are unprepared, but Forretress cannot keep stealth rocks up reliably, and Toxic spikes are useless against Poison and levitators. Toxic is also a good option to Hit Gastrodon and Jellicent, the ladder being able to stop Forretress from keeping hazards off, but it doesn't hit a lot of other targets, and is useless versus many common threats on sand teams, including Clefable, Reuniclus, and Gliscor. additionally, many pokemon run lum berry, such as Dragonite and Volcarona. Hidden Power Fire is an excellent lure for Scizor and Ferrothorn, but otherwise has poor coverage and damage output, making forretress useless versus Keldeo and Substitute Kyurem-Black. Volt switch provides good momentum, but it doesnt help versus ground types, and means that Forretress will more often switch out then in, making it a lot more passive. Explosion also enables offensive teams when paired with sturdy, but many of the common pokemon in the tier, such as Tyranitar, Ferrothorn, and Landorus-Therian, can shrug it off with relative ease. Counter is also a nice option to stop Dragonite with multiple boosts and can use its bulk to pick off common pokemon like Landorus-Therian and Excadrill, but it otherwise has no utility aside from that, and is useless versus mixed attackers as they will target its weaker special defense.
[CHECKS AND COUNTERS]
Trappers: Magnezone can remove Forretress without much issue, and Heatran can bypass sturdy with Magma Storm, and set up rocks once it's gone.
Set up sweepers: Volcarona and Reuniclus can tank most of what forretress can do, and set up Quiver dances and Calm minds to steamroll the rest of its team. Dragonite can set up on Forretress lacking Hidden power ice, and Scizor can stack Swords dance boosts on Forretress lacking Hidden Power Fire.
Hazards and Ghost types: Hazards limit how many times Forretress can switch in, and will decrease its ability to tank hits. Jellicent can wall whatever Forretress tries to do, and can burn it with Will-O-Wisp, or prevent it from setting hazards with Taunt.
Strong special attackers: Choice Specs Latios can chip down forretress over the course of the game, and Keldeo can offload devastating Choice Specs boosted hydro pumps for free, or set up with Calm mind. Alakazam with Hidden Power fire also scare away Forretress, however it can take non-hidden power Alakazam.
Bulky walls: Clefable can knock off valuable leftovers from Forretress, and can paralyze it with thunder wave, making it very easy to play around. Blissey can do the same, except it can support its teammates with wish too. Ferrothorn can get hazards for free against non Hidden Power Fire Forretress, and can make it very hard for it to find chances to spin later in the game.