Metagross-Mega @ Metagrossite
Ability: Clear Body
Level: 50
EVs: 252 Atk / 4 SpA / 252 Spe
Jolly Nature
- Iron Head
- Ice Punch
-
Grass Knot
- Thunder Punch
Zard Y/Hippo/Lele teams got you feeling blue?
No worries, here's a Metagross for you~~
Grass Knot takes advantage of Mega Meta's Tough Claws to deliver a 2HKO on Hippowdon that will shock your opponent into a rage quit (or at least a forfeit). T-Punch 2HKOs SpDef Celesteela and bops non-bulky Zard Y as well as giving you a better damaging move than Iron Head vs Fini.
Calcs:
4- SpA Tough Claws Mega Metagross Grass Knot (120 BP) vs. 252 HP / 4 SpD Hippowdon: 144-170 (66.9 - 79%) -- guaranteed 2HKO
4- SpA Tough Claws Mega Metagross Grass Knot (120 BP) vs. 252 HP / 252+ SpD Hippowdon: 100-118 (46.5 - 54.8%) -- 56.6% chance to 2HKO
252 Atk Tough Claws Mega Metagross Thunder Punch vs. 0 HP / 0 Def Mega Charizard Y: 148-176 (96.7 - 115%) -- 81.3% chance to OHKO
P.S. Worth noting that Ice Punch actually does more to SpDef Hippo than Grass Knot. However, since you can't actually tell whether or not it's SpDef Hippo in Team Preview, just go for Grass Knot on the expected Hippo switch-in and then decide your next play based on the damage.
P.S.S. the 4 SpA investment actually does make a significant difference in the roll on SpDef Hippo! Don't forget the 4 EVs!