As a Pokemon trainer, you have seen a lot of Pokemon variants in your life, their evolutions. And the Electric Mouse Pokemon has one of simpliest evolution stages. But the particular one you got? He is much more different. Not only this male Pikachu you found in the wild noticeably looks more different than the average Pikachu(darker fur, crimson eyes, a fur around the head that resembles hair... and a bit more slim yet big body), he also behaves differently! Your other Pikachus have usual energetic and happy-go-lucky personality, but this Pikachu you named "Red" due to eye colour is more reversed, "blunt" and even... agressive when in incredibly bad mood? He even electrocuted you few times in process of befriending him. Overtime you managed to get a bond with him, so now, he acts more like a grumpy cat in your presence , which is good enough. Better than what was at beggining.

You are in the room, currently grooming the rest of your Electric Pokemon with a brush, each Pikachu making satisfied noises during the fur brushing. In the corner of your eye you caught Red, the "different" Pikachu almost glaring at his trainer(you) having bonding with other Pikachus. Frozen in place... With his tail and lowered ears twitching. He needs some grooming too! Time to beckon Red close.