You can find a Weedle in White Forest.
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In the Pokemon forest
It is only possible to get Weedle in Pokemon Yellow by either trading it from Pokemon Red or Blue versions, or use the Mew Glitch and battle certain trainers.
You can't get weedle you have to trade it from fire red or leaf green
to find weedle you have to put fire red or leaf green in the gba slot then got to eterna forest and use the pokeradar or just migrate it from fire red or leaf green
It is uncommon to find one in HeartGold, it can be found in the National Park during the Bug-Catching Contest.