When you reached your 21st battle you will battle Palmer and his Pokemon are:
Dragonite, Rhyperior, and Milotic
When you reached your 49th battle you will battle him again and his Pokemon are:
Heatran, Regigigas, and Cresselia
He is your rival's dad also the Battle Tower Tycoon.
about 40 to 50. (it worked for me in Pokemon platinum) hope this helps
Temporal tower is in Pokemon Mystery Dungeon: Explorers of Time, Darkness and Sky, not Pokemon Platinum.
Train your pokemon, and catch 'em all!
You can't catch it in Pokemon Platinum but you can get it in Pokemon Pearl in Eterna Forest at night or in the Lost Tower.
the tower in solaceon town
Battle Tower
Yes for Pokemon platinum
Right below Solaceon Town, there is a tower by the river.
get a high winning streak at battle tower
21st consecutive Milotic Rhyperior Dragonite 49th consecutive Heatran Regigigas Cresselia
you get 20 BP you get 20 BP