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All Pokemon that have a x0.25 resistance to Grass:
DragoniteAltariaSalamenceRayquazaDialgaReshiramSkorupiCrobatZubatGolbatButterfreeWeedleKakunaBeedrillParasParasectVenonatVenomothScytherLedybaLedianSpinarakAriadosYanmaForretressScizorBeautiflyDustoxMasquerainNinjaskWormadam (Green)Wormadam (Pink)MothimCombeeVespiquenYanmegaSewaddleSwadloonLeavannyVenipedeWhirlipedeScolipedeEscavalierDurantLarvestaVolcaronaGenesectSkarmoryDialgaCharizardMoltresHo-OhHeatranBulbasaurIvysaurVenasaurBellsproutWeepinbellVictreebellHoppipSkiploomJumpluffRoseliaTropiusBudewRoseradeShayminFoongusAmoongussFerroseedFerrothorn
Sorry if I repeated a Pokemon. LET THE UPVOTES COMMENCE! xDHope I helped. :)
Source: Multiple places of Serebii