Fan created Pokemon events

Answer 1

Yes there have been instances of fans creating custom Pokémon events such as making a Volcanion that knows the V-create attack which is usually an exclusive attack for Victini, Floette's Eternal Flower form, a Shiny Mew that knows the moves of Magma Storm, Geomancy, Origin Pulse and Thousand Arrows, a Shiny Genest, a Shiny Zygrade with two attacks that are likely to be attacks that it cannot naturally learn, a Shiny Arceus that knows the Light of Ruin attack which is an exclusive move for the Eternal Floette, Zekrom and Reshiram, Xerneas and Yvelta, Jirachi, Keldeo, Shaymin, Meloetta, Celebi, Dialga, Palkia, Ho-Oh, Lugia, a Shiny Hoopa that knows the attacks of Dragon Ascent and Spacial Rend and Freeze Shock.

Answer 2

there isn't any