Roselia locations — where to catch

In Lumiose City (Legends: Z-A)

• Wild Zone 7 — Walk

In Hisui (Legends: Arceus)

• Cloudpool Ridge — Walk
• Cottonsedge Prairie — Walk
• Fabled Spring — Walk
• Gapejaw Bog — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Great Marsh — Walk
• Route 208 — Walk
• Route 209 — Walk
• Route 210 — Walk
• Route 212 — Walk
• Route 221 — Walk
• Route 224 — Walk
• Route 225 — Walk
• Route 229 — Walk
• Sea Route 230 — Walk
• Trophy Garden — Walk

In Johto & Kanto (HeartGold & SoulSilver)

• Johto Safari Zone — Walk

In Hoenn (Ruby, Sapphire & Emerald)

• Route 117 — Walk

Other games (8)

• Brilliant Diamond / Shining Pearl (Gen 8): Great Marsh, Route 212, Route 221, Route 224, Route 225, Route 229, Trophy Garden
• Sword / Shield — The Isle of Armor (Gen 8): Max Lair
• Sword / Shield (Gen 8): Axew's Eye, Bridge Field, Dappled Grove, Dusty Bowl, East Lake Axewell, Giant's Cap, Giant's Mirror, Hammerlocke Hills, Motostoke Riverbank, North Lake Miloch, Rolling Fields, South Lake Miloch, Stony Wilderness
• Sun / Moon (Gen 7): Ulaula Meadow
• Omega Ruby / Alpha Sapphire (Gen 6): Hoenn Route 117
• X / Y (Gen 6): Kalos Route 7
• Black 2 / White 2 (Gen 5): Lostlorn Forest, Unova Route 12, Unova Victory Road 2
• XD (Gen 3): Phenac City

Roselia — full Pokédex entry