I made a Smogon Account just to reply to this but ever since Gen 6 i've been using a similar Red-card Slurpuff set in OU. https://pokepast.es/1e82f36d780deb7ahttps://pokepast.es/d5036f8e8830ee25
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Slurpuff is the lead and main Pokémon to start this team off. It’s level 93 in order to be fast enough to out pace most things and get down to the sash quicker than what would be able to be achieved at higher levels. Play rough is there in order to win the magic coat war against deoxys-speed but if you don’t care for the deoxys speed magic coat war you could go misty explosion to keep the sticky web up. Yawn over endeavor in order to keep Pokémon from setting up on the lead and forcing it to swap unless they give a Pokémon on this team a free turn.
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Chi-yu was the main purpose of building this team as its super powerful nasty plotted boosted stabs in fire blast, dark pulse, and flamethrower. Darkinium-z to drop anything that would threaten it or a defog as a boosted black hole eclipse ohkos ho-oh from full health while doing the same to all neutral targets. With koraidon it’s sun boosted attacks do massive damage and accomplish many things that it wouldn’t be able to do such as 2hkoing special defensive Pokémon such as chansey. However, the lack of bulk on the physical side makes chi-yu susceptible to extreme killer arceus that have a life orb on top but still take massive damage from an extreme speed. However, it is the 2nd most powerful mon on this team and has the highest chance of breaking through stall teams. That’s what the rest of the teammates are for mostly.
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Zacian is by far the 3rd most powerful mon on this team. Due to sticky web support it could run adamant nature further boosts its attacks and swords dance to boost its attacks further. With tera fighting close combat after a swords dance and intrepid sword it has a chance to ohko with a stab close combat on standard Primal Groudon ev spreads (tho I do suggest if you are gonna take the gamble check the calc on other potential groudon spreads)
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The second special attacker of the team and a lure for ho-oh. Once again due to the webs eternatus was given a modest nature to further boost its attacks. Meteor beam needs no introduction as it’s one of the main offensive sets for eternatus granting it a special attack boost after using it. Power herb to ignore the 2 turn affect. This allows it to fire a 120 base power rock move on anything. Tera fire to muscle through along side koraidons sun for powerful flamethrowers/fire blasts(if you prefer the power) while hitting fairies with sludge wave/sludge bomb(if you prefer the poison chance).
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This mon needs no introduction. This S- tier Pokémon is an amazing pokemon being able to break through Pokémon without needing a boost do to orichalcum pulse and life orb boosting its dragon claw, beefy low kicks, and sun boosted flare blitz. Koraidon is give swords dance and a jolly nature in order to tie with scarf koraidon under webs. Swords dance is to break and destroy the opponent if it gets a free turn.
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The mighty primal groudons omnipresent nature has found itself on this team as well. Abusing the webs with an offensive stealth rocks set and hitting hard with tera ground boosted precipice blades. Though if you feel like your not using stealth rocks that often you can run more into speed and run dragon claw as this set struggles with giratina-origin.
I'm glad that there are other awesome slurpuff users out there on the internet.