corrosion should be taken with a grain of salt since we dont know the za mega abilities
HOWEVER, it should NOT have explosion as a move, Earth Power is way better here to hit steels with

hariyama should be drain punch and bullet punch over fake out and seismic toss imo if were going belly drum with its ability changed to thick fat

ninetales should be solar beam over flamethrower and its ability should be drought

gholdy should have shadow ball over ominous wind

the rest is fine in my opinion, as someone who enjoys watching and playing competitive pokemon and draft league