hi i beat silver trench and its really hard heres a guide to help you people. But before you can even go to silver trench you must beat the game. Then recruit the 3 legendary birds. After that you should talk to Alakazam. He tells you to go to their friend area. They say they awakened the sea guardian and they give you a vortex stone.
SILVER TRENCH UNLOCKED
Items you should take:
6 petrify orbs
4 reviver seeds
4 max elixers
4 huge apples
and two other items you want to take.
At least be lvl 50 before you try this dungeon
I beat the dungeon with those items with only a lvl 51 Charzard.
Also if you want lugia you need your teams max size to be 1 or 2
The floors you should use the petrify orbs on are floors 15, 35, 55 and 75 because the have big monster houses with about 35 pokemon. There might be some more monster houses but they wont be any trouble because there tiny.
After you beat all four monster houses and get up to lugia its easy!!
I beat lugia by using fly 3 times.
On your first time in this dungeon dont recruit any pokemon untill you have lugia because the other pokemon will wonder off and waste your reviver seeds!
Pretty much every pokemon in the Silver Trench is a water pokemon so an electric pokemon will breeze through this dungeon.
After you beat lugia and you unlock its friend area and it joins your team
It has a 99.9% recruit rate so if it doesnt join your team... your REALLY unlucky.
After you recruit lugia you unlock meteor cave. Meteor cave is where you get deoxys