Question

in heartgold and soulsilver are there any wild Pokemon that are at a higher level than mt silver?

Answer 1

No, there are no non legendairies in hg or ss that are wild and higher leveled than in mt. Silver.
Mewtwo is also very high leveled in cerulean cave at lv. 70

Comments

i never said anything about legendaries

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It's still the same, theyre found in mt. Silver.

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but the answer to the question is yes