When will the first Pokemon in the party affect which wild Pokemon appear in Red/Blue?

Jan. 6, 2023

I seem to remember someone telling this to you in Pokemon blue. Some experiences of mine also seem to confirm. Anyone have more info?

Pleaselog inorregisterto add a comment.

There are no held items, abilities, bike modifiers, or first-step grace periods to complicate things here.

Once the game has decided to throw something at us, it generates the wild Pokémon’s level. Again, this is dead simple. Each entry in the area’s encounter table has a species and a level. The species and level are randomly pulled from the weighted encounter table, then compared to the lead Pokémon’s level if Repel has been applied. It doesn’t check if the lead is conscious, though, unlike every other generation.

source

The first Pokémon won’t change any encounters outside of hypothetical RNG and encounter manipulation glitches.