>>24863549>but it's actually canon that eggs materialise from the energy of friendship felt between the two pokemon.>>The two don't seem to like each other>is a valid breeding pairthe only invalid breeding pair says "The two prefer to play with other Pokémon than with each other."
Which suggests the Pokémon er... Play with each other.
Exactly how is left to the imagination. thats explicitly saying breeding is a result of physical activity, aka sexual intercourse, as much as possible within the confines of a kid-friendly game.