Fire Red Battle Tower

I've beaten Fire Red countless of times but never once have I attempted to take on the Battle Tower, until now (mostly because I'm board and curious). I've chosen a team already but if anyone has any suggestions on changes or extra advice in taking on the challenges, it would be most helpful.

I'm planning to take on the Singles Challenge first.

My team looks like this:

Charizard Lvl 100
Blast Burn
Flamethrower
Dragon Claw
Earthquake

Blastoise Lvl 100
Hydro Cannon
Surf
Ice Beam
Earthquake

Venusaur Lvl 100
Frenzy Plant
Sludge Bomb
Giga Drain
Earthquake

Raichu Lvl 100
Thunder
Thunderbolt
Brick Break
Iron Tail

Pidgeot Lvl 100
Double- Edge
Fly
Ariel Ace
Steel Wing

Tyranitar Lvl 100
Earthquake
Rock Slide
Crunch
Thrash