List of Pokémon that would usually have gender differences, but don't in PMD T/D/S:
Butterfree
Kadabra
Alakazam
Goldeen
Seaking
Scyther
Sudowoodo
Quagsire
Girafarig
Gligar
Scizor
Ursaring
Octillery
Houndoom
Torchic
Dustox
Nuzleaf
Roselia
Gulpin
Numel
Camerupt
Cacturne
Shinx
Luxio
Luxray
Roserade
Pachirisu
Weavile
Tangrowth
Portrait differences only:
Rattata
Raticate
Zubat
Golbat
Hypno
Rhyhorn
Rhydon
Politoad
Aipom
Murkrow
Sneasel
Piloswine
Ludicolo
Meditite
Swalot
Starly
Staravia
Staraptor
Kricketune
Kricketot
Ambipom
Croagunk
Toxicroak
Finneon
Lumineon
Abomasnow
Rhyperior
Mamoswine
Overworld differences only:
Venusaur
Pikachu
Raichu
Xatu - Quite noticeable from the back
Beautifly
Medicham
Milotic - Has quite large sprites, so you'd be able to see it anyway
Bidoof - Can see it well from the side and the back (Pretty much any direction but the front)
Buizel - Can see it well from the back
Floatzel - Same as Buizel
Gabite
Garchomp
Portrait and Overworld differences:
Gloom - Really noticeable from all angles
Vileplume - Same as Gloom
Doduo
Dodrio
Magikarp
Gyarados
Meganium
Ledyba
Ledian
Wooper
Wobbuffet
Steelix
Heracross
Combusken - Can see it well from all angles
Blaziken - Can see it best from the sides and the back
Relicanth
Bibarel - Obvious from the front and sides
Combee
Gible
Hippopotas
Hippowdon
Snover
I pointed out the noticeable differences of Pokémon rby didn't rip the female equivalents of. Bidoof needs the Male version ripped.
Butterfree
Kadabra
Alakazam
Goldeen
Seaking
Scyther
Sudowoodo
Quagsire
Girafarig
Gligar
Scizor
Ursaring
Octillery
Houndoom
Torchic
Dustox
Nuzleaf
Roselia
Gulpin
Numel
Camerupt
Cacturne
Shinx
Luxio
Luxray
Roserade
Pachirisu
Weavile
Tangrowth
Portrait differences only:
Rattata
Raticate
Zubat
Golbat
Hypno
Rhyhorn
Rhydon
Politoad
Aipom
Murkrow
Sneasel
Piloswine
Ludicolo
Meditite
Swalot
Starly
Staravia
Staraptor
Kricketune
Kricketot
Ambipom
Croagunk
Toxicroak
Finneon
Lumineon
Abomasnow
Rhyperior
Mamoswine
Overworld differences only:
Venusaur
Pikachu
Raichu
Xatu - Quite noticeable from the back
Beautifly
Medicham
Milotic - Has quite large sprites, so you'd be able to see it anyway
Bidoof - Can see it well from the side and the back (Pretty much any direction but the front)
Buizel - Can see it well from the back
Floatzel - Same as Buizel
Gabite
Garchomp
Portrait and Overworld differences:
Gloom - Really noticeable from all angles
Vileplume - Same as Gloom
Doduo
Dodrio
Magikarp
Gyarados
Meganium
Ledyba
Ledian
Wooper
Wobbuffet
Steelix
Heracross
Combusken - Can see it well from all angles
Blaziken - Can see it best from the sides and the back
Relicanth
Bibarel - Obvious from the front and sides
Combee
Gible
Hippopotas
Hippowdon
Snover
I pointed out the noticeable differences of Pokémon rby didn't rip the female equivalents of. Bidoof needs the Male version ripped.