It's not like you to take someone's words out of context.
They got rid of stamina because of being locked in to Squirtle, Ivysaur, and Charizard.
If you can choose which three Pokemon you want to switch between, then reintroducing stamina for trainer is a great way to balance the multitude of options.
Read my post dude, not a phrase.
Sure, let me go on more details on why your idea doesn't mesh with Smash Bros.
Honestly- it is very tricky.
You yourself admit it's tricky and complicated. That's a huge red flag right there.
Smash isn't a complicated game. It's meant to be easy to get into, although definitely hard to master.
If I'm going to go with keeping everyone in that is already in (for Ultimate's sake)
- I would separate the Pokemon Trainer into four characters-
- the three Pokemon, and a Trainer, who functions by choosing any three Pokemon and replacing their down B (and reintroducing stamina to balance out the choice option)
- possibly even a move that 'catches' the opponent (or an alternative version of moveset where the Pokeball is just a weapon).
Cluster**** #1: this is a terrible idea. It makes even the character selection a convoluted mess. Even with Pokémon Trainer in Ultimate, it feels straightforward to play as him. You pick him, you can select which of his 3 Pokémon is sent out first. Simple and efficient.
Stamina mechanic got removed because it's simply bad design because it can force you on a bad match-up against your opponent. Having one less move to choose from so you have an option to switch character can already put the character in disadvantage let alone having another disadvantageous gimmick on top.
- I would have Eevee make it in with a gimmick based around evolution, themed to different stages and times. His moveset changes slightly, but he can only be evolved once in the match, and each evolved form functions with very slight differences based on element. Not all evolutions would be available to each set/ game.
This is actually an idea I can get behind, but with Eevee having as much as 7 evolutions, it definitely becomes difficult to balance.
Here's my take on it: you just play as Eevee, and when some kind of meter gets filled (i.e. like Little Mac's KO meter or Cloud's limit gauge), you can use a special move to choose an evolution like Shulk's Monado Arts. Eevee keeps evolved for the rest of the match, so the differences between each evolution have to be slight and balanced.
- I would include Team Rocket with Meowth who has flash summons, representing both the summoning aspect of Pokemon, and the cheating nature of the Teams of Pokemon.
- Possibly with alt versions for each team
Cluster**** #2: summoner characters are usually very difficult to work with and balancing, which is probably why it hasn't been done in Smash yet. How would this even work? How would the moveset flow? Does a moveset like this even work in Smash? Lots of questions.
I would give Squirtle an echo in Piplup.
Piplup doesn't even have the same body proportions as Squirtle. This doesn't even work from a design standpoint. This said, Piplup could share some moves with Squirtle but would have to be a semi-clone at the very least, if not a completely unique character.
Maybe Zoroark echo for Lucario, with a switchup of Aura for a Mewtwo ability.
This is simply a bad idea from pre-Smash 3DS/Wii U speculation. Again, different proportions and the fact that Zoroark barely has anything in common with Lucario
outside of being furry bait.
tl;dr - Messy ideas that don't mesh with Smash, vague ideas that you fail to describe how would they work in Smash, having no clue how echoes/clones even work.
I get that you want more accurate representation of Pokémon (whatever that means) and you do have some good ideas, but your way of executing them is anti-Smash in terms of philosophy. You're trying to cram as many Pokémon game mechanics without even considering whether they work in Smash and mesh with the rest of the gameplay or not. It's a convoluted mess.
It's as illogical as suggesting that Mario should only take two hits, shrinking in the first, because that's an "accurate representation" of his games. It would be, but it also wouldn't work.
So, once again, gameplay > representation. It's better to sacrifice some representation in order to have fun characters than the other way around, that's why the Pokémon Trainer is looking to be a much better character in Ultimate than he was in Brawl. "Representation" means jack squat if it only harms the overall gameplay experience.