Battle Tower Team Help?

[Deoxys Ribonuke]

I seem to keep losing soon after your defeat Palmer the first time, so I was wondering if someone could help me out with my team:

Weavile @Life Orb (or Expert Belt?)
Jolly (+SPD -SpATK)
Pressure
-Ice Punch
-Brick Break
-Night Slash
-Pursuit

(I'm leaving her as is, mainly because I want to use her in competetive play as well, and that's the standard moveset.)

Dusknoir @Leftovers
Impish (+DEF -SpATK)
Pressure
-Will-o-Wisp
-Focus Punch
-Pain Split
-Substitute

(I wanna replace this guy with someone else that I'll list later.)

Porygon-Z @Wise Specs
Timid (+SPD -ATK)
Adaptability
-Ice Beam
-Thunderbolt
-Dark Pulse (Nasty Plot wasn't recieving much use and was therefore unneeded)
-Tri-Attack

(I need to choose between this and Starmie)

Starmie @Expert Belt
Modest (+SpATK -ATK)
Natural Cure
-Surf
-Psychic
-Ice Beam
-Thunderbolt

(I need to choose between this and Porygon-Z)

Now, as a replacement for Dusknoir, due to the fact that I wanted something that had attacks that could pick off enemies, I was thinking--

Cresselia @Leftovers
Bold (+DEF -ATK)
(EVs? Help?)
Levitate
-Moonlight
-Ice Beam
-Charge Beam
-Reflect/Thunderwave?

I need hellllp...

[Ryuk003]

After defeating Palmer the first time, the teams increase dramatically in strength. You're much better off simply losing on purpose and re-doing the first three waves, earning 26 BP each time.