As a Pokémon expert, I can tell you that in the Pokémon games, Pikachu is a type of Pokémon that is known for its Electric typing. The move Surf is a Water-type move that allows a Pokémon to travel on water and also use it in battle to attack opponents.

In the mainline Pokémon games, Pikachu cannot naturally learn Surf. However, there are ways to teach Pikachu Surf through the use of Technical Machines (TMs) or by breeding. When it comes to breeding, if you have a Pikachu with Surf in its move set, you can breed it with a compatible partner. The offspring will not inherit the Surf move from the parent directly, but there is a chance that the offspring will have a Hidden Ability, which is unique to the offspring and not the parent.

Here's the process in English:

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You also cannot breed this Pikachu to pass down the Surf move. ... To get a Surfing Alolan Raichu, simply expose your Surfing Pikachu to a Thunderstone. To get a Surfing Kanto Raichu is a little more involved.read more >>