Gaia The Dragon Champ.
To get him you have to get Gaia to level 4 and Curse of Dragon to level 4.
How To Get Sinister Serpent
Ok when you beat the game load your account and goto the shop if it's not there try after you beaten the game at least 3 times.
How To Get Three Blue Eyes White Dragon
First time you beat kiba he has only one blue eyes,
but if you get to him in the last level,
he has two.
Get Red-Eyes Black Metal Dragon
To get Red-Eyes Black Metal Dragon, get Red-Eyes Black Dragon to a level 3 or 4 and select "Evolve" on your turn
on a "Dark" attributed stage.
How To Get To The King Colisum
You have to go through every stage (first opponent is pegasus).
To get Dark Magician, you have to gain access to
the fourth area or higher. Grandpa will say he
has some new capsules, so check it out. It will
be in the dark section of the capsule shop, near
the top. It may take a little while, but worth it
for an A-ranked capsule.
Destroy your opponet's symbol and you will
usually get 100 PP.
Each time you beat the game you will get 3 of
the following monsters at random: Sanga of
Thunder, Red-Eyes Black Dragon, Javelin Beetle,
Dungeon Worm, Super War Lion, Fortress Whale,
Giltia the Dark Knight, and Rigras Leever.