Not sure if anyone noticed but, convinently, we get a new Rogue Mega and it's stone which gives us an advantage vs next ranked Battle:

Mega Victreebel resists Canari Electric type and is SE vs Terragon.

Mega Hawlucha gives us an advantage vs Ivor including his Mega Falinks

Mega Barbanacle gives us an advantage vs Carbou Mega Scolipede

Mega Frosslass gives us an advantage vs Lebanne whole Team and it's Ice type has an advantage vs Mega Clefable Flying type

Finally, Mega Dragonite resists Griselle's Mega Pyroar and it's Dragon type is SE vs Grisham Mega Charizard X Dragon type. Plus both Griselle and Grisham use Pseudo Legendaries.