You can beat a ghost type with another ghost type (Like Haunter)
you can't
I would choose a Dark or Ghost type
The first two Pokemon sent out are claydol and xatu. To defeat claydol you can either use water, grass, ice, bug, ghost or dark, I would recommend using a water type because that means you can use surf which will also do damage on xatu. To defeat xatu your best of using a electric, ice, rock, ghost or dark. I would not use a electric type because it weak againist claydol and claydol will just knock your electric Pokemon out with earthquake. So try use a dark or ice type Pokemon, I would recommend using a flying type Pokemon for example I used pelipper and gyarados that way claydols earthquake will have no effect. For defeating lunatone and solrock I would recommend using water types on both of them, do not use fire types against any of them. Both of them are also week against grass and steel types.
Rock type Pokemon are strong against flying, ice, bug and fire type Pokemon.
Xatu is a Psychic and Flying type pokemon.
Xatu is #178 in the national pokedex, and it is a Psychic-Flying type Pokemon.
the Pokemon will has is lv40 xatu, lv 41 jynx, lv 42 xatu, lv 41 slowbro, lv 41 exeggutor mostly all of his Pokemon are weakened by ghost types. Once you beat the elite four once he has higher level pokemon, like 55 or so.
Xatu is not a legendary Pokemon
A Dark type, Rock type, Ice type, or an Electric type.
Xatu can be caught in the Safari Zone.
there is no xatu
Xatu and Xerneas.
Claydol is mainly a Ground-type Pokemon and Xatu is a Flying and Psychic-type. Using Claydol and Xatu together in battle is a great combo, as it makes type advantage hard - the key to winning a battle. Ground-type Pokemon are weak against Water, Grass and Ice attacks and have an advantage over Electric, Fire, Poison, Rock and Steel-types. Flying-types have an advantage over Grass, Fighting and Bug-type Pokemon but are weak against Electric, Ice and Rock-types. Psychic Pokemon are strong against Fighting and Poison-types but can be stopped by Bug, Dark and Ghost types. Now let's look over this to see which Pokemon would be a good idea: An Ice-type Pokemon would be a good go here, as it matches with Claydol's Ground-type and Xatu's Flying-type. The only drawback would be with Xatu - it's attacks would be only half as effective against it. But don't worry. A good Ice-type would be a Glalie or a Regice. A Dark-type Pokemon would also be a good idea as it packs a punch against Psychic-types. They are hard to come by though, so that's quite a drawback. A good Drak-type Pokemon is Absol. You could use a Rock or Water-type Pokemon as backup and a Electric-type Pokemon after you've beaten Claydol. Be sure to raise your Pokemon to an even level with Tate and Liza's Pokemon.
Ground type Pokemon can beat Electric type Pokemon easily.
Xatu
easy i beat the whole game ok this is what u will need swallow your starter a mightyena and anything higher then 50