To use Mantine underwater, you must find a spot where '?' appears over your head, like you did with Blastoise in Vien Forest.
If this is a question based on the mission where you have to reclaim the key from the Sharpedo, there is a chasm that you cannot cross to the far south. You will get a voicemail telling you how to ride Mantine when you come across the chasm.
I hope this answers your question. =)
Go to Route 223 use surf and where i caught mine is at Sunyshore. So go there then go to the beach part surf around there then you will see it ^^
You can't catch it, but you can transfer it over from Diamond, Pearl, or Platinum
You can't get mantine in firered only emerald and colosseum can.
catch 2 rematorades and 2 octillary
you cant catch persian in heartgold.... i think
you need a silver wing
You should catch him,he has a lot of HP and he's also stong.
You can get a Larvitar from Mt. Silver or from the Safari Zone (Mountain) with 5 Peak Objects.
The same way as you catch other Pokemon, whittle away its HP to red, and try to give it a status condition such as Paralysis or Sleep (don't Burn or Poison it). Throw balls at it (Ultra/Great mainly) and hopefully you will catch it.
In HeartGold, give a Mantine the Wave Incense and breed it. The egg with hatch into a Mantyke.
Catch a Remoraid. Keep it in your party as you level up Mantyke.
the way to cianwood
You'll need to level it up with a Remoraid in your Party.
Route 223 (Water Surface)
You can't catch Rotom in heartgold.
You can't fish up Mantyke. You have to surf to find it. Try Route 223.
you cant catch him in heartgold you can only get him in soulsilver
In HeartGold you can catch Kyogre.
You can only catch Vulpix in SoulSilver, not in HeartGold. You can catch it on route 36 and route 37.
In pokemon Heartgold
No