Platinum expands the Sinnoh Pokedex over Diamond and Pearl. More Pokemon are available before the Elite Four, including Fire types that DP lacked. Houndoom and Flareon show up before postgame now. Giratina is the box legendary, caught in the Distortion World as part of the main story. Same 493 total roster, better distribution across the game.
Showing 225 Pokemon: the regional Pokedex plus transfer-only species.
How to access additional Pokemon in Platinum
Platinum bumps the Sinnoh Dex from 151 to 210, and the extra species fix Diamond and Pearl's worst problem: almost no Fire types before postgame. Houndoom, Flareon, and all five Rotom forms are available during the main story now.
National Dex upgrade works the same way. See all 210 Sinnoh entries, talk to Rowan, and Oak shows up to expand your catalog to 493. Pal Park still handles GBA transfers. The Battle Zone and Survival Area open routes with wild encounters that didn't exist in DP.
Porygon2
Porygon-Z
Scyther
Scizor
Elekid
Electabuzz
Electivire
Magby
Magmar
Magmortar
Swinub
Piloswine
Mamoswine
Snorunt
Glalie
Froslass
Absol
Giratina
Mewtwo
Mew
Raikou
Entei
Suicune
Lugia
Ho-oh
Celebi
Latias
Latios
Kyogre
Groudon
Rayquaza
Jirachi
Deoxys
The national dex is still 493, but the regional Sinnoh dex jumped from 151 to 210 Pokemon. Platinum didn't add new species. It added access. Fire types that were locked behind the National Dex in DP show up before the postgame here, and several other coverage gaps are filled.
The Sinnoh dex is expanded from 151 to 210 Pokemon. Houndoom, Flareon, and other missing types are available before postgame. Giratina is the box legendary with a Distortion World storyline. The Battle Frontier replaces the Battle Tower. Gym Leader and Elite Four teams are remixed. And the game runs faster.
Yes. The Distortion World is part of the main story. After the events at Spear Pillar, you enter the Distortion World and battle Giratina in its Origin Forme. Level 47, 680 BST. It's a mandatory encounter, so save before the fight.
Gen 4, Nintendo DS, 2008. Platinum is Sinnoh's third version. The regional dex grows from 151 to 210 Pokemon compared to DP. Giratina gets a full Distortion World storyline, and the Battle Frontier replaces the Battle Tower. Same gen, better pacing.
Five battle facilities replace Diamond and Pearl's single Battle Tower: Battle Tower, Battle Factory, Battle Hall, Battle Castle, and Battle Arcade. Each has unique rules and a Frontier Brain boss. It's the postgame endgame for competitive-minded players.
- Gen IY
Yellow151 Pokemon - Gen IRB

Red & Blue151 Pokemon - Gen IIGS

Gold & Silver251 Pokemon - Gen IIC
Crystal251 Pokemon - Gen IIIRS

Ruby & Sapphire202 Pokemon - Gen IIIFRLG

FireRed & LeafGreen151 Pokemon - Gen IIIE
Emerald202 Pokemon - Gen IVPt
Platinum210 Pokemon - Gen IVHGSS

HeartGold & SoulSilver256 Pokemon - Gen IVDP

Diamond & Pearl151 Pokemon - Gen VBW

Black & White156 Pokemon - Gen VB2W2

Black 2 & White 2301 Pokemon - Gen VIXY

X & Y457 Pokemon - Gen VIORAS

Omega Ruby & Alpha Sapphire211 Pokemon - Gen VIIUSUM

Ultra Sun & Ultra Moon403 Pokemon - Gen VIISM

Sun & Moon302 Pokemon - Gen VIILGPE

Let's Go Pikachu & Eevee153 Pokemon - Gen VIIISwSh

Sword & Shield400 Pokemon - Gen VIIIPLA
Legends: Arceus242 Pokemon - Gen VIIIBDSP

Brilliant Diamond & Shining Pearl151 Pokemon - Gen IXSV

Scarlet & Violet400 Pokemon - Gen IXLZA
Legends: Z-A364 Pokemon - Gen XWW

Winds & Waves51 Pokemon