Normally you can catch it in pearl after beating the elite 4 but in diamond the only way is to trade with someone who has a sealeo on their pearl, or migrate it from emerald.
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you can't catch sealeo but you can catch spheal in rt. 30
At lvl 32 spheal evolves into sealeo. hope it helped :D
sealeo evolves into a walrein in level 44.. good luck in your Pokemon adventure
Level 44.
Level 44 :D