You do not need a Wailord to catch a Registeel in Pokemon Emerald. You may need a Wailord or any other water-type Pokemon to surf to the place where you catch Registeel, but other than that, you don't need a Wailord.
yes and you can get those three Pokemon in Pokemon emerald after you get a relicanth and a wailord
no you do not just the Pokemon relicanth and wailord.
Yes, you need both Wailord and Relicanth to complete the braille puzzle in Pokémon Ruby, Sapphire, and Emerald. In the game, these two Pokémon must be placed in specific slots of your party to unlock the entrance to the underwater cave where you can catch the legendary Pokémon, Registeel, Regice, and Regirock. Their positions correspond to the ancient braille writing that indicates the need for these specific Pokémon.
You only need Wailord to unlock the three caves. You don't need it in your party in order to actually catch it.
yes
relicanth and wailord
You need relicanth and wailord to catch the regis in sapphire/ruby/emerald. You cannot catch the three regis in platinum unless you have the event Regigigas (this event has now ended). If you have the special regigigas in your party, three new caves will open up in Sinnoh and you will be able to catch the three regis.
In order to catch Registeel in Pokemon diamond, you need to have gotten a level 100 Regigias from a mystery event. This mystery event has passed, so you can no longer get Registeel in Pokemon diamond, unless a friend trades you the mystery event Registeel. The only other way to get Registeel is to trade him from Pokemon emerald, ruby, or sapphire.
Registeel is not catch able in Pokemon LeafGreen. In order to get a Registeel you will need to trade for one from Pokemon Ruby or Sapphire.
You can find Registeel in the Ancient Tomb on Pokemon Ruby, Sapphire and Emerald. It can also be found in the Underground Ruins of Pokemon White2. To get Registeel in Pokemon White2 you need to catch or defeat Regirock and use the Iron Key reward to unlock the Iron Chamber containing Registeel.
U need a wailord and renculs
YES! there are secret pokemon! regice regirock registeel rayquaza ( true u can catch it aswell u can also get other ones by eggs need annyhelp on the regis or the rayquaza email me at war_pig10@hotmail.com goodluck mate :) regis are abit hard u need wailord and relicanth wailord u evolve or TRY to catch and relicanth is under water nere mosdeep trench