Another reason I don't think we'll see a Legends Trainer as DLC - Pyra and Mythra share animations on almost all of their attacks. They have different particle effects / range / frame data, but they're still able to operate on the same rigs. This probably saves a ton of resources on animation, which is the only reason I think a transformation character as DLC was possible.
A Legends Trainer wouldn't be able to do this. Pokemon generally have completely different models and wouldn't be able to share animations. On top of this, you'd be making three of them instead of just two. That'd be three characters with completely unique animations, sold at the price of one. As cool of a send off I think it'd be for Smash, I don't think it'd be feasible or all that profitable.
Also there's the issue of timing but I've mentioned that before.
A counterpoint though, all 3 Pokémon they would have are already close to being full models in smash, making it easier to do.
Cyndaquill has been a pokeball Pokémon. Just import its models and upscale it a bit and there you go. It would be like the melee characters essentially.
Oshowatt is a Pokémon ball, but you could use it as a base to model dewott.
Decideueye sounds like Sakurai actually did models and work in with how he talks about it. Very plausible imo that they have a model in game laying around somewhere they could use.
Some of the attack animations can be taken from Pokémon trainer like Ember for example. Now if the final forms of the starters are different in that game then it may be harder. But depending on the decideye counterparts design, they might be able to repurpose the model they have.
It be trickier to do another trainer but I don’t think it’s unlikely. It’s a first party character so they save big on the licensing and music budget. Which definitely is a big part of the budget for a character.
Gamefreak also gives Sakurai models super early, so there is a good chance he would have plenty of time to implement this character if he wanted. It may also be why the pass has a December deadline. Maybe we get the trainer revealed in like September or something with a October release date. By then we will probably learn something on Legends as it would be a few months out. The shinnoh remakes would be around the corner As well. Syncing up pretty nicely imo.
You’re not counting right. Remember. It was four slots AFTER you gave one to each of the 6 fp characters. Meaning one of the three Pokémon already had a spot. Meaning only two are needed for the other two. Then mythra takes one. Leaving one left.
I could be wrong but I’m pretty sure the trainer themselves would take one of the six slots with the Pokémon filling the three slots left in that scenario as I’m pretty sure that’s how the trainer is coded now but again I may be mistaking.