No.
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A trainer in Pokemon is one that owns Pokemon and battles with it to have it become stronger.
Pichu then he evolved it into pikachu
Most people use repels and avoid Trainer battles because usually they are in a hurry. Getting into a battle might distract them. People want to just get to their destination as soon as they can so they avoid battles.
Just train them up in large sections of grass , or go in trainer battles , there is not secret to strong Pokemon just hours of work !
Route 205 just before the Eterna Forest entrance. The trainer starts off with a Piplup, but after multiple battles, it'll evolve eventually.