There is no such area. Thier is, however, a game for gamecube called Pokemon colloseum
You cannot catch a Stantler in Firered get one from Pokemon emerald or Pokemon colosseum.
You have to trade one from emerald, colosseum or xd to firered to have it.
Get another from leafgreen or another firered or get one from Pokemon colosseum.
You can but only from trading with Pokemon emerald or Pokemon colosseum.
You must transfer from Pokemon XD or Colosseum.
It must be traded to you from emerald or Pokemon colosseum.
No only in firered and colosseum.
Sunflora is uncatchable in firered to get one either get a sunflora from Pokemon colosseum or Pokemon emerald.
Sneasel isn't in FireRed. You can trade Sneasel from LeafGreen or Colosseum.
You cannot get mantine in firered only emerald and colosseum can.
U cannot capture stantler in firered, emerald and Pokemon colosseum can
Unfortunately you can't get sunflora in firered the only way to get is either from Pokemon emerald or Pokemon colosseum.