Question

I just got it from the event so is it like celibi where your can go to shrine and go back in time

Answer 1

When you get it a new PokéWalker Course appears. It's Night Sky's Edge with A-Pokémon Clefairy ♂/Jigglypuff ♂
B-Pokémon Zubat ♂/Hoothoot ♀
C-Pokémon Geodude ♂/Onix ♀
and items:
TM29-Psychic
Moonstone
Rare Bone
Star Piece
Green Shard
Yellow Shard
Red Shard
Blue Shard
Pearl

Answer 2

When you get Jirachi, you can also train it as you wish!
It also adds another pokemon to your Pokedex data!