There are a lot of problems with this "check" (not even a counter).Mesprit, hmmm….
Okay, I've got one!
View attachment 25472
Mighteyena @ Toxic orb
Ability: Quick feet
-Protect
-Crunch
-Heal Bell/rest
-Facade/Sleep Talk
EVs: 252 ATK/252 HP, 4 Speed
Adamant nature
4 Speed Quick Feet Mightyena does not even outspeed Timid Mesprit; at least 56 Speed EVs are needed, but HP invested Mightyena is still a mediocre set outside of responding to Mesprit, and even then...
252+ Atk Mightyena Crunch vs. 0 HP / 0 Def Mesprit: 216-254 (71.7 - 84.3%) -- guaranteed 2HKO
252 SpA Life Orb Mesprit Dazzling Gleam vs. 252 HP / 0 SpD Mightyena: 296-351 (86 - 102%) -- 12.5% chance to OHKO
Mightyena can only switch into Psyshock; any other attack Mesprit goes for spells doom for Mightyena. And as you can see, Mightyena does not even have a guaranteed chance to win even if it does switch into Psyshock, since Crunch does not OHKO.
Not even a check.
xzern, use Hidden Power Mesprit next time, Ice Beam doesn't do much for Mesprit.