Few quick thoughts on this meta after hitting #1 on the ladder as I'm really enjoying it:
In a tier that is so defensively prepared for Zacian I honestly think Ekiller Fireceus with tera-normal is the scariest offensive threat. The ability to blow up pretty much everything with just Flare Blitz and STAB Espeed is unmatched, particularly with hazard support. At +2 and with marginal chip, you blow past Palkia-O, Dialga that isn't 252/252+, Cyclizar, Palafin-H with marginal chip, Urshifu-R and pretty much everything that isn't Zacian (who has to play tera guessing games anyway) and fringe options like twave Pult and Ceruledge (who I think is really underrated).
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Extremely strong and potentially broken. With a grassy seed boost becomes very hard for ekiller Arceus and Palafin to revenge kill, and at +2 blows up everything in the meta. I've been dealing with it by adapting with random tera-ghosts but if the Sneasler predicts right you're cooked anyway. Not sure what counter-play can be explored for this - Hippo can survive at max health and whirlwind it out but I think we're going to have to wait for Giratina or something to drop or this could get out of hand.
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Arceus in general is imo an extremely healthy presence in the meta because it allows a lot of freedom in defensive teambuilding. The only reason this meta isn't a complete mess is because you're able to bolster your defensive backbone with this mon just through sheer bulk despite having to deal with its shit typing. Really big fan of the mini Arceus meta.
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Definitely has the ability to take over games but I don't actually think it's banworthy. Allows offensive and balance teams a good out vs various strong wallbreakers like Palkia-O but I think the meta has enough defensive options like Amoonguss, balloon Ghold etc that it doesn't feel extremely unhealthy.
Overall really fun meta and I hope it stays popular because I think there's a ton of room for meta development. Nothing feels super egregious atm but I do feel like Sneasler could become problematic at some point if the meta is unable to properly adapt.