Pokemon that are evolved from Baby Pokemon are considered Basic Pokemon, as is illustrated by the Pokemon TCG. This means Pikachu is a Basic Pokemon and Raichu is a Stage 1.
The exception to this rule is with Lucario and Riolu, who is considered a Baby Pokemon by the game and a Basic Pokemon by the TCG. This means Lucario is a Basic Pokemon by game standards and a Stage 1 by TCG standards. It's really quite a confusing mess.