Raichu | Pikachu's last evolve form
Raichu is the last evolve form of Pichu and next evolve form of Pikachu, as the last evolve form he/she has the abilities and stats that easily surpasses the earlier forms of his/her evolve tree. If I would describe Raichu, it is a bigger sized Pikachu which is still cute with dark orange colored body and darker stripes on the back. It also have longer tails and unique ears that Pikachu. A Pikachu can evolve into a Raichu when exposed with a thunder stone it is both explained in the game and the anime series as well.
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have you heard of the Alolan Raichu? it is both a psychic and thunder type pokemon having Raichu riding its tail like a surfboard.
Yup I heard it thanks for the additional information you can use hede.io to add that information but in your own words without getting some reference to wikis, lets do it the fun way :D