3rd Gen I love using rental Pokemon!

[Hydro Pumper]

The Battle Factory for sure. I love using rental Pokemon since it's interesting and fun to use Pokemon with movesets you didn't create yourself. You can't really make a strategy in advance, you need to think of a tactic on the spot, which I also like about the Battle Factory. <3

 

[LightOfTruth]

All of the places of battle fronter in Emerald are good :)

 

[Sayan]

My favorite place in all of Emerald is Battle Tower. It's the most strategic and the least RPG-ish place IMO. If only the AI was a bit better and switched more often (trick them a Choice Band and then Grudge the PP, they'll stay in and let you set up.)

I also like the Battle Factory because of the randomness, but sometimes you simply get stupid movesets like special attacking Gyarados. And I give the 3rd place to Battle Dome because of its great feel.

I really didn't like Battle Pyramid though.

 

[mikey]

I like the factory also, I think using rental pokemon is fun and a nice change. I wish I can keep some of them :3

 

[vaporeon7]

My favourite would have to either be the Battle Dome or the Battle Pike. I absolutely love how the Dome is like a tournament, I made me feel like I was having battles in the Pokémon League in the anime. The Battle Pike was good as well because I was always lucky and didn't have to battle people.

 

[Jellicent♀]

Battle Pike for sure. The complete randomness of the challenge is what made it fun. I loved Lucy, she's my favorite Brain of all. I think my second would have to be the Battle Palace. It was just fun seeing what moves your Pokemon would and wouldn't use. I had a Salamence that didn't like to attack and a Blissey that wanted to do nothing but use Blizzard on everything.

 

[PlatinumDude]

I like the Battle Factory because the randomly generated rental Pokemon there change each time, allowing me to use different battle strategies each round.