Pokémon Platinum Kaizo: Byron split

What opens up at this point in the game, and everything you can catch by now that you couldn't before.

Now usable

• Surf — Surf (HM03, from Mr. Backlot at the Pokémon Mansion after beating Gentleman Butler)

Newly reachable

Newly catchable (130)

AbsolAggronAmpharosArcanineArmaldoBanetteBeldumBlastoiseBreloomBronzorCastformCharizardCherrimClefableCorsolaCradilyCrawdauntCroagunkCrobatDewgongDittoDonphanDrifblimDrifloonDrowzeeDugtrioDusclopsDuskullElectrodeFearowFeraligatrForretressFroslassGalladeGardevoirGastlyGengarGirafarigGlalieGligarGolbatGolemGorebyssGravelerHariyamaHaunterHonchkrowHoundoomHuntailHypnoJumpluffJynxKabutopsKadabraKangaskhanKecleonKinglerKrabbyLaironLeafeonLickitungLumineonLunatoneMachampMagikarpMagmortarMagnetonMamoswineManectricMantykeMarowakMasquerainMedichamMeganiumMisdreavusMismagiusMukNidokingNidoqueenNidoran♂NinetalesOctilleryOmastarPersianPiloswinePolitoedProbopassPuruglyQwilfishRelicanthRhydonRhyperiorRoseradeSableyeSalamenceSandslashSeadraShellosShuckleShuppetSkarmorySkiploomSlowbroSlowkingSneaselSnoruntSolrockSphealStaraptorStarmieSteelixSudowoodoSurskitSwalotSwellowTangelaTentacruelTorkoalTyphlosionUrsaringVenusaurVespiquenVictreebelVileplumeWalreinWeavileWeezingWigglytuffWobbuffetXatu

TMs you can now pick up

• TM23 Iron Tail — Iron Island — B2F, right room, south-west item
• TM35 Flamethrower — Fuego Ironworks — Below furnace (needs Surf)
• TM48 Skill Swap — Canalave City — First house upon entering city, from woman
• TM59 Dragon Pulse — Victory Road B1F — First path after ascending waterfall, left side of room (needs Waterfall, Rock Climb, Strength, Surf, Rock Smash)
• TM71 Stone Edge — Victory Road 1F — Top of room, above Full Restore (needs Rock Climb, Strength, Rock Smash)
• TM72 Avalanche — Snowpoint City — From Candice (needs Defeat Candice)
• TM74 Gyro Ball — Canalave City — Clearing south of canal (needs Surf)
• TM77 Psych Up — Pokémon Mansion — Backlot Mansion, right-most room, top-right corner
• TM79 Dark Pulse — Victory Road 1F — Via top left entrance (needs Waterfall, Rock Climb, Strength, Surf, Rock Smash)
• TM84 Poison Jab — Route 212 — Across the first lake (needs Surf)
• TM85 Dream Eater — Valor Lakefront — Next to northern house (needs Rock Climb)
• TM89 U-turn — Victory Road B1F — Ledge one level above bottom-right corner of water (needs Rock Climb, Strength, Surf, Rock Smash)
• HM03 Surf — Pokémon Mansion — From Mr. Backlot after defeating Gentleman Butler (needs Defeat Butler)
• HM04 Strength — Iron Island — From Riley, at cave entrance

Bosses around here