The Trainer Hill. A Function well known from FireRed/LeafGreen. This Hill has you climbing up several floors of trainers and Battling it out. You can use any Pokémon and the opponent's level matches that of your highest Pokémon

The Trainer Hill in Emerald is found just North of Mauville City. There are 2 floors of trainers and a roof. You get prizes depending on how quick you got up there

The Layout of the Trainer Hill and the trainers in it change with the Upcoming Battle-E Cards for Pokémon Emerald. However the US won't likely have this function and will just increase the amount of floors and battle types.

Below is a list of the basic, un-changed Japanese Layout:

Here are the DEFAULT Japanese Floors Floors Step By Step. Note, the Pokémon Levels are the same as your Highest Pokémon

Floor 1

This is a relatively straightforward floor as you have two ways to get into Battle, however one way means you have to trek round again. This is a double Battle and afterwards you have tiles to take you up

Youngster & Parasol Lady	Zigzagoon	Shroomish	Sandshrew	Wingull	Numel	Surskit

Floor 2

This is a relatively straightforward floor as you have one way to get into battle, some Jump Tiles & soem rotate tiles

Beauty & Ninja Kid	Spheal	Spoink	Poochyena	Electrike	Baltoy	Corphish

The Roof

Nothing up here except a person who congratulates you, you don't get anything for it though which is a bit of a let down really but you have now completed Trainer Hill.

alterine cave

Altering Cave, identical in many aspects to the Cave of the Same Name in FireRed/LeafGreen. It holds a mystery. The Pokémon in this cave alter when you use the Wonder Spots in real life.

It is situated on Route 103 after you beat the Elite 4. Here is a list of all the Pokémon in it

mirage island

Mirage Island is in Emerald, obtainable the same way as in Ruby & Sapphire. Based on set values of Pokémon and the Island having to match. Click here for detailed info
On it, as with in Ruby & Sapphire is a patch of grass and a Berry Tree holding the rare Liechi Berry, which is found nowhere else in Hoenn
And finally, in the grass is nothing but Wild Wynauts, the un-evolved Wobbuffet at levels ranging from Level 5 to Level 50

And thats all that's on Mirage Island

story of emerald

This game, as it doesnt feature prominently on Groudon or Kyogre...features on both and Team Magma & Team Aqua's quest to get both of them

Before Leaving Lilycove City, you need to go to Mt. Pyre and get the Magma Symbol. After that you need to go to the Magma Hideout at the base of Mt. Chimney and get through it to the end to met Maxie as he Awakens Groudon
After doing the Aqua Base in Lilycove and the 7th Gym aswell as getting rid of Magma from the Space Center with Steven, you'll need to find the Underwater Cave where Team Aqua are headed. They intend to awaken Kyogre, and they do
Heavy Rain Starts and sometimes cuts out for strong sunlight. Get to Sootopolis City and you will see Groudon & Kyogre are there fighting. However earlier when you left Mossdeep, your rival called you up saying the they had seen a Green Dragon near Pacifidlog town. Steven will let you into the Cave Of Origin to find Wallace. Once you've spoken to Wallace and told him about the Dragon, he'll tell you to meet him at the Sky Pillar
Go to the Sky Pillar and go all the way up and you'll find Rayquaza, Awaken him and he'll fly off. Fly back to Sootopolis and a Cut Scene will Start

Rayquaza Cries out and sends Groudon & Kyogre back to the sea to sleep. Rayquaza then flies off and you'll find him back at the Sky Pillar Catchable
Groudon will be found in the Land Cave after beating the Elite Four
Kyogre will be found in the Sea Cave after beating the Elite Four

pokemon emerald

the way to find all regi(ice,rock&steel)

1.First thing you do need to do is go to Route 134 as usual into the Diving Spot. Once in there, real the Braille on the far inscription and use Dig. The Door will open. Now here is the change, in that room go and read the Inscription. Now put Wailord First in your party and Relicanth last (it was reversed in RS) and read it again. An Earthquake will occur and the doors will open

2.First we will start with Regirock. His cave is in the south of the Desert so go there. When you get there, read the inscription and then go 2 Steps Left, 2 Steps down and then use Rock Smash. The Door Will Open and you can battle Regirock at the usual Lv. 40
3.Secondly we'll continue with Regice. His cave is in Route 105 so go there. When you get there, read the inscription and then do a clockwise lap of the cave, staying next to the walls at all times. Once you have done a full lap, The Door Will Open and you can battle Regice at the usual Lv. 40
4.And we'll end with Registeel. His cave is in Route 120 so go there. When you get there, read the inscription and then go to the middle of the room and use Flash. The Door Will Open and you can battle Registeel at the usual Lv. 40