>>29151184>it's a different pokemon and not just a form changeBecause it can't go back to being Type: Null afterwards unless it lost its trainer and got a new mask somehow.
Both Lycanrocs will most likely share base stat totals and movesets with some differences.
All four Oricorios will probably share the same base stat total and movesets with some differences.
Silvally is a literal improvement over Type: Null with better base stats, and a different moveset.
There is no way for Silvally to return to being Type: Null, the Pokemon it evolves from. So isn't it an evolution?