I don't actually own Emerald, but I've borrowed it twice (Once to make a game and go through it, this time I'm borrowing it from my girlfriend to raise her Pokemon/Hoenn Dex), and that was certainly enough for me to fall in love with the Battle Frontier. But of course, I do prefer some of them over the others (Favouritism!)
In order starting from least favourite
7. Battle Pyramid
The only part of the Battle Frontier that I despise, it just wasn't very fun
6. Battle Dome
I like the tournament setup, but the lack of Battle Points hurts it
5. Battle Palace
It's funny to watch the Pokemon just do whatever... and yell when they do something stupid XD
4. Battle Pike
Random paths are fun. Good times versus Lucy's Shuckle too XD (Kecleon wins)
3. Battle Factory
I figure, a great way to learn how to beat a Pokemon is to use a Pokemon, and what better way then to use random Pokemon! (Despite my recent team being Octillery, Kecleon and something else, where I've already raised an Octillery and Kecleon
)
2. Battle Tower
Sweet and simple, just battling
1. Battle Arena
I don't know what's so appealing about it, it just is
In order starting from least favourite
7. Battle Pyramid
The only part of the Battle Frontier that I despise, it just wasn't very fun
6. Battle Dome
I like the tournament setup, but the lack of Battle Points hurts it
5. Battle Palace
It's funny to watch the Pokemon just do whatever... and yell when they do something stupid XD
4. Battle Pike
Random paths are fun. Good times versus Lucy's Shuckle too XD (Kecleon wins)
3. Battle Factory
I figure, a great way to learn how to beat a Pokemon is to use a Pokemon, and what better way then to use random Pokemon! (Despite my recent team being Octillery, Kecleon and something else, where I've already raised an Octillery and Kecleon
2. Battle Tower
Sweet and simple, just battling
1. Battle Arena
I don't know what's so appealing about it, it just is