Pokemon Gameshark Silber Whats The Difference Between Gameshark And Action Replay For Pokemon Pearl/Diamond (DS) ?

Whats the difference between Gameshark and Action Replay for Pokemon Pearl/Diamond (DS) ? - pokemon gameshark silber

Please help me, I do not know if I can find the Shiny Pokemon Gameshark! I bought one in ebay! What is the difference between the GameShark and Action Replay? Can you catch shiny pokemon in the colon and capture legendary Pokémon like you want? (As a Celebi, Mew, and others?) Sorry for my English) =