Question: pokemon let's go pikachu how to cross water?
Answer: There, you'll spot a man hanging out near a Lapras. Talk to him, and he'll teach your Eevee or Pikachu the Sea Skim Secret Technique in Pokémon: Let's Go. After that, you can use Sea Skim to cross over water and encounter wild Water-type Pokémon in Pokémon: Let's Go.