From these, it can be assumed that Imposter Professor Oak does have some mechanical knowledge of his own, since he is stated to be an inventor
Theres also the traditional Craterhoof Behemoth, of course, but its fun to try different things, too
Pokdex entries Game locations In side games In events Wild Area News Held items Stats Base stats Charizard Mega Charizard X Mega Charizard Y Pokathlon stats Type effectiveness Charizard and Mega Charizard Y Mega Charizard X Learnset By leveling up By TM/TR By breeding By tutoring By a prior evolution By transfer from another generation Anime-only moves Side game data Mega Charizard X Pokmon GO Mega Charizard Y Pokmon GO Evolution Forms Mega Evolution Gigantamax Sprites For other sprites and images, please see Charizard images on the Bulbagarden Archives
Could totally eat my words on this, but that's what I predict
When this monster is destroyed by card effect or battle: Destroy all monsters on the field
The sideboards, of course, are meta-dependent