Pichu can probably be acquired by breeding on four island (after beating the elite 4) by either having a female pikachu/raichu or by using a ditto with a male one (ditto can be found in Pokemon mansion, or [easier] route 8)
No, only in Pokemon Diamond/Pearl and Emerald/Ruby/Sapphire.
It powers up Electric-type moves when held by a Pokemon. Hope I could help.
Mukrow can be found at Eterna forest at night.
The Darkrai is found on Newmoon Island in the game Pokemon Diamond. To reach the island players will need to sail.
no it can not.
Pichu evolves by happiness.
That Pokemon is pichu.
you get it at trophy garden
For diamond there are found at the Pokemon mansion on route 212 I would assume it is the same for Pearl and platinum
in mrs bachlot mansion
not hard
in pokemon pearl/diamond it is in the trophy garden
when it has high friendship
you can get it at the trophy garden
Breed it with a Voltorb
arceus or shiny pichu event
They are found in the trophy garden.