These Pokemon all come a with higher base Attack than Onix, which makes no sense at all.
Onix (Pokémon GO) - Best Movesets, IVs, Counters, PvP, Weakness, Shiny
Pokemon That Are Stronger Than Onix
Pokemon That Are Stronger Than Onix
Janina's Onix, Pokémon Wiki
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Onix's base attack is lower than Oddish's : r/pokemon
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Onix - #095 - Pokédex, pokemon onix stats
How to Evolve Onix in Pokémon Legends: Arceus - VGKAMI