you have to have at leats all 3 legendary birds to get silver trench.
Go to the birds freind area.
I am absolutely positive of this answer, what you do is recruit Articuno, Zapdos and Moltres and then you talk to Alakazam in the Town Square. He will tell you to go to Legendary Island. The Legendary Birds will give you access to the Silver Trench.
Gengar helped Xatu and Alakazam. You see him there in a cutscene.
honestly I've never tried it..
If you are talking about Pokemon mystery dungeon red rescue team or Pokemon mystery dungeon blue rescue team then: Talk to alakazam, he'll mention something about the 3 great birds. once you go to them they will give you a stone which allows you into a new dungeon which has lugia.
you nned articuno,zapdos and moltres,then talk to alakazam,then go to legendary island,the trio titan will make a item,if i remember,it's a vortex stone
recruit articuno zapdos and moltres
You don't battle, or even see Lucario. However, there is a Rescue Rank named after him, and Alakazam will mention Lucario when you speak to him.
i don't quite remember, but i think you go defeat groudon and save alakazam's team. Or you might go to town square, where blastoise, golem, and someone from team constrictor that i cant remember the name of are chosen to go beat groudon. Basically, try going to town square
You can rescue Alakazam's team in Magma Cavern where you defeat Groudon That is the only place I have rescued them so far because i havent beat the game yet
yes
Nope