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all of them (except for auzmarill) get 2 hit koed after a ddance.... you guys are SEVERELY underrating mega gyarados , (i might add azumarill to the check list thou since its a soft check)
azu takes 40% max from +1 stab and ohko with pr.
mgyara needs adamant + good rolls to 2hko ferro at +1 and power whip does like 80%
Gyarados needs jolly for MManec and even at +1 it won't kill Megatric even after taking 2x stealth rock damage