Hi I want to win the Ancient Tower, because I want an ancient fossil. I heard you need a lot of sitrus berries, and I was wondering, approximately how many sitrus berries do you need if you have a base giratina with exp lock and you want to get a tower score of 50?

They are hard unless you have a whole team of experience lock giratinas.

There's a cap of 10 sitrus berries per session so you really don't need much, also there's a low chance of you getting up to 50, average people have gotten are 20-35.