Those that donate to the
POKÉMON with YOU charity campaign from March 11th, 2017 until March 31st, 2017, can receive a special Pikachu knows the move Bestow. Players can receive this Pikachu on their copy of
Pokémon Sun or Moon. It also knows the moves: Hold Hands, Return and Play Nice and it is holding a Sweet Heart.
Source:
https://donation.yahoo.co.jp/detail/4761001/