You would have to trade a groudon from ruby or emerald to colosseum to have one.
If you have Pokemon heartgold, you cannot get groundon unless you trade with someone who caught a groundon on soul silver. PS- It has to be from the embedded tower, any migrated groundon will not work.
talk to everyone in the whole game to get a groundon.
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not really
no
Groundon
You cant
The Colosseums are... The Gateway Colosseum, the Main Street Colosseum, the Waterfall Colosseum, the Neon Colosseum, the Crystal Colosseum, the Sunny Park Colosseum, the Magma Colosseum, the Sunset Colosseum, the Courtyard Colosseum, and the Stargazer Colosseum.
You don't get Groundon on leaf green. Only in Pokemon Ruby version, if you want one ask a freind to trade for one.
The final Colosseum is the Deep Colosseum after the Game, Pokemon here are Level 60-65, this is where you can catch the Pokemon you missed from the Admins earlier and a Shadow Shuckle.
if you can connect colosseum to a gba, then trade the Pokemon to the gba game and migrate!
kyorge celebi and groundon