Last time on Pokémon: Battle Frontier:
"A wild Elekid has run wild throughout a local forest, and its come upon Ash, May, Brock, and Max! As our heroes try to figure out what's making Elekid so angry, Phanpy battles the wild Pokémon to hopefully weaken it and calm it down. Seeing how powerful the Elekid is, Team Rocket wants it for themselves, and creates another new mecha in order to capture the Baby Pokémon. But Phanpy evolves into Donphan in the middle of the battle, and with its new Hyper Beam it blows away Team Rocket and cures Elekid of its overcharging!"
This week on Pokémon: Battle Frontier:
"Our heroes wish to cross the Cycling Road in order to get to Fuschia City, though why they just didn't go the way they did back during the Indigo Saga nobody has a clue. Unfortunately, the Cycling Road isn't operable due to an overgrowth of strange vines! In comes a Pokémon Ranger known as Solana to the rescue! She's convinced this is caused by a Celebi and searches dilligently for the Legendary Pokémon, using her Capture Styler to temporarily take control of Pokémon. Will Solana and Ash find Celebi? Will this episode cause more people to buy Pokémon Ranger™, which comes out next week, only for the Nintendo DS™? And more importantly, why air the Ranger episode to promote the 1-hour Deoxys 2-parter, when said 1-hour Deoxys 2-parter aired 2 hours earlier?"
Spoilers: Eh, it aired a few weeks ago, so spoilers aren't a big deal here.