>>586687971. Teammates are a bigger liability than you think. Chunsoft's AI is downright rudimentary because most other Mystery Dungeon games don't allow recruiting teammates.
2. Some pokemons are created more equal than others. Try having a go with either Drifblim or Smoochum first to get your bearings. They've perfect blend of versatile movepool, gentle exp curve and amazing abilities to lessen the burden of starting over at level 1.
3. This game is a *roguelike*, not roguelite. Failing is part of the progression. Sometimes you didn't have enough apples, or max elixir, or some trap you stepped on left you with no means to fight. Just start over, savescumming is the norm, not the exception.
Good luck with your run!