Toxapex / Charizard Mega Y Stall

Synergy

Toxapex is the stall anchor, cycling in and out with Regenerator and Leftovers while chipping opponents down with Toxic and Infestation behind Baneful Bunker and Wide Guard. Sinistcha's Trick Room exists purely to cancel an opponent's own Trick Room rather than to set up a sweep, and its Rage Powder and Hospitality keep the rest of the team topped up. Grimmsnarl's Prankster support (Fake Out, Reflect, Parting Shot) buys safe turns for the slower half of the team. Choice Scarf Hydreigon and Mega Charizard Y provide the speed and firepower to close games once the opponent has been worn down by chip damage.

Win Conditions

Stall the opponent out with Toxapex's Toxic and Infestation chip while Baneful Bunker and Wide Guard block spread damage, cycling HP back through Regenerator and Leftovers. Snorlax's Fissure offers a low-odds instant KO against bulky walls that would otherwise stonewall the chip plan. Once the opponent is worn down, Choice Scarf Hydreigon or Mega Charizard Y clean up what's left.

Lead Options

Charizard Y + Grimmsnarl, Hydreigon + Sinistcha, Toxapex + Hydreigon

Threats

Steel types resist or ignore Toxapex's poison damage entirely and were the deciding factor in the one loss shown, since neither Toxic nor Infestation can touch them. Fissure's low accuracy makes Snorlax's win condition unreliable. Rain and Trick Room teams that can out-pace or out-stall this squad's own plan, and strong special attackers that punish Sinistcha or Grimmsnarl before they can set up support, are also noted risks.