Due to the lack of evolutionary stones, you cannot evolve any of the starter Pokémon as of episode 1
Phoenix Rising gives the player a choice of one of three Starter Pokémon at the beginning. They are given to the player by Professor Lotus's assistant, Tim. The player has the choice between three Pokémon: the Grass-type Petilil, the Water-type Staryu, and the Fire-type Growlithe.
Each one of these Pokémon evolve via stone, highlighting the emphasis on choice-based game-play in Phoenix Rising, and can mega evolve.