Musings about how to depict Mewtwo in Pokémon Journeys era-stories
(slightly reworked from an old SB post back when the news first broke that Masachika Ichimura would reprise his as Mewtwo role for an episode of Pokémon: Journeys - and which could now be applied for fanfics instead)
Mewtwo should be portrayed as the frankensteinian supergenius superscientist existential philosopher that happens to be a (superpowerful, if not the most powerful) pokemon, rather than a superpowerful pokémon that happens to be smart if that detail is currently relevant. In my mind, every time he appears there should be some big idea to expose kids to - which the story (and he himself) is engaged with.
Any raid battle against him should last a minute with the conclusion 'no, fuck you. Mewtwo cannot simply be caught let alone beaten (see: Gary's battle). That you're still present and alive is simply because Mewtwo doesn't want to teleport you away and forget he exists/turn back time so you haven't met him/make your head asplode. No, the rest of this episode is about [dealing with] social anxiety or it being okay to be different and/or some philosophical debate.' And any subsequent guest appearance at the lab when he might decide to show up has him engaged in conversation with someone (be it philosophy with Ash and Goh, or science with one of the researchers, or what have you) and eating standing at the table rather than being like Mr Mime and sitting on the floor with the other pokémon like a pet. And have things get to the point that the viewer has to be reminded 'ohhhyeeeaaaahhhh, he's also one of the most powerful pokémon in the world.' Whatever the current problem that's going on while he's around that needs to be brute forced is fixed. Now moving on to the more cerebral problem of the special episode that can't be solved by snapping Mewtwo his fingers....
(This isn't to complain about what Mewtwo was doing in the actual episode, mind - though one does have to assume that he was holding back during the battle for Ash's sake. I just remembered the post and figured that the musings may give people ideas)