Your starter Pikachu in Pokémon Yellow has a unique happiness mechanic. Its happiness level affects certain in-game events and dialogue.
- Checking Happiness: Talk to your Pikachu by pressing 'A' when facing it (not in battle). Its expression will indicate its happiness: a happy face means high happiness, a sad face means low.
- Increasing Happiness: Walk with Pikachu, win battles with it, use items on it, and avoid letting it faint.
- Special Events: A happy Pikachu can lead to unique interactions:
- Bulbasaur Gift: If Pikachu is happy enough, an NPC in Cerulean City will give you a Bulbasaur.
- Charmander Gift: An NPC on Route 24 (north of Cerulean) will give you a Charmander if Pikachu is happy.
- Squirtle Gift: Officer Jenny in Vermilion City will give you a Squirtle if Pikachu is happy.
Keeping Pikachu happy is not just for flavor; it's crucial for obtaining all three Kanto starter Pokémon!