In the house next to the Pokemon center in Olivine city the sailor sitting at the bar will give you HM04 [strength] after talking to him.
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In Pokemon series, you generally find HMs soon before or right after you beat gym leaders.
HM STRENGTH HM STRENGTH
You can't find Mew in Pokémon Silver.
You need Surf, Whirlpool , strength
You can find sunkern in national park