I'll organize them by region.
Kanto:caterpie, weedle, oddish, bellsprout, venonat, paras, pidgey, and ekans.
Jhoto:ledyba, spinarak, hoothoot, zubat(cause it evolves into crobat),sentret, pichu, cleffa, igglybuff, and oddish for bellossom.
Hoenn:wurmple, zigzagoon, pocheyena, lotad, seedot, taillow, wingull, ralts, and sirskit.
Sinnoh:Starly, bidoof, kriketot, shinx, budew, burmy, combee, pachirisu, and cherubi.
Unova
atrat, lillipup, purloin, pansage, pansear, panpour, munna, pidove, and woobat.
You don't have to catch something but I put hope you find something you like.
Yeah I know I mean the pokemon your partner finds.