You earn them through duping your 3 stars and earning shards from more difficult content. And for the love of god, this ain't pokemon! Champs don't evolve.
Full crystals and crystal shards can be won in different parts of the game: arenas, quests, etc...
The more difficult the content, the better. (You will not find 5* shards in easy quest, but if you go for master level, you will)
tkgsgxk
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The more difficult the content, the better. (You will not find 5* shards in easy quest, but if you go for master level, you will)