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Beedrill: It can kill Exeggcutor. That's it.
Arbox: It has Glare. It can do super effective damage to Tangela.
Onix: The obviously superior Rock/Ground choice between Rhydon and Golem.
Farfetch'd: It can learn Fly. Also, having Swords Dance is nice even if you get it at level 31.
Dewgong: You can sweep Lance with this guy, but his stats are abysmal.
Ditto: You can have unlimited coverage with this thing. Too bad you have to waste a turn each time to use it.