MMXCM Theme Team- Steel Massimo

Hey guys, was going to post pics then realized that I cannot here. So I am creating theme teams based on different characters from different games, particularly this one is MegaMan X Command Mission and the character I chose to build a team around is Steel Massimo.

Champions Meta:

Mega Chestnaught

Blastoise

Forretress

Tyranitar

Aggron

Bastiodon

You guys think it fits the character or are there better pokemon that fit him better? Also the theme teams are not built around sustainability, they are built around simply theme and fun.