The bell clapper is hanging from the ceiling. Jump up and get it. Once you have scared away the seagull, you can fix the school bell in the tower.
(see related question)
Turn the light on and look by the ceiling. The bell clapper for the school bell is hanging there. (Also, you can talk to Artur, who got stuck down there.)
You can read the phone number if you open the item bag and click on the SHOVEL card.
use the item finder app on your poke wach and look around the hotel use the item finder app on your poke wach and look around the hotel
look around with the item finder and buy some at department stores.
look around with the item finder app on the poke watch.
After getting the national dex you can find johto Pokemon roaming around the sevii islands AKA islands 1-7. Take a look around each island to find all the johto Pokemon, here are some hints where to look: One island, Four island, Five island, Six island, Seven island.
You can look around the island all you want. The "Underground Tunnel Tour" requires tickets. (see related question)
there is one at the cinnabar island just look around
The secret master ball is in mewtoo's lair. Look around with the item finder for it.
All unknowns are in the seventh sevii island, you just have to look around.
You look around for Mew and I do not know the other Pokemon, but it will be level 30.
look around the place for them there practically every where