The Battle Pike (Japanese: バトルチューブBattle Tube) is a facility within the HoennBattle Frontier in Pokémon Emerald. The structure is a long pike in the design of a Seviper.
The player is challenged to make it through seven rooms, but before each one they are given a choice of three rooms to enter. In any room, one of the following eight events may occur:
Single battle: A Trainer with 3 Pokémon walks up to the player and battles.
Double battle: Two Trainers each with 1 Pokémon walk up to the player and battle.
Single battle and healing: The Single battle Trainer is more difficult than usual and the winner's Pokémon are completely healed.
No event: An NPC stands in the room but does nothing.
Status effect: A surprise attack will inflict a status on one or more of a player's Pokémon. The status includes Kirlia's burn, paralysis, poison, or sleep and Dusclops's burn or freeze.
One or two recovery: One or two of the player's Pokémon will be healed.
Full recovery: All three of the player's Pokémon will be healed.
The player may not change the order of his/her party during a challenge.
In the area where the player must pick one among the three rooms, a lady standing outside will name one room and hint at what is in that room. Each quote has two possibilities, but the first is more common than the second.
Quote
Result 1
Result 2
For some odd reason, I felt a wave of nostalgia coming from it...
Status ailment
Heals one or two Pokémon
Is it...A Trainer? I sense the presence of people...
Single battle
Heals all Pokémon
It seems to have the distinct aroma of Pokémon wafting around it...
Wild Pokémon
Single battle, then heal party
I seem to have heard something... It may have been whispering...
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
This section is incomplete. Please feel free to edit this section to add missing information and complete it.
Pike Queen
The Frontier Brain of the Battle Pike is Pike Queen Lucy. She challenges Trainers who complete two passes through the pike (Silver) and 10 passes through the pike (Gold). By beating her, one is awarded with the Luck Symbol.
Milotic was Lucy's second choice after defeating Seviper, where, with a single Hydro Pump it was able to defeat Donphan. In the fight against Ash's Pikachu, Milotic managed to deal severe damage to Pikachu, but Pikachu won after using Volt Tackle in one of Milotic's Twisters.
This section is incomplete. Please feel free to edit this section to add missing information and complete it.
In the Ash & Pikachu manga
The Battle Pike in Ash & Pikachu
In the Pokémon Adventures manga
The Battle Pike in Pokémon Adventures
In the Pokémon Battle Frontier manga
The Battle Pike in Pokémon Battle Frontier
Trivia
A girl inside the Battle Pike says "I've completed the challenge 10 times now, but I've never had to battle a Trainer once." This information would be false, because after two straight wins and again at ten straight wins, she would have to battle Lucy. However, it should be noted that she did not state whether or not she beat the Battle Pike ten times in a row, so this might not necessarily be an error.