While there is no legit way to combine Pokemon there are various cheats and hacks which allow you to do so.
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After you get 10 emerald fragments you can combine it in the pokemon lab and then you put it on your first pokemon in your party and u can catch zapados (I don't know where zapados is)
You cannot combine Pokémon.
You can't find eggs just like that anywhere. Togepi is in an egg, the egg given to you by Professor Elm to carry along. Any other eggs you need two opposite gender Pokemon for it or one of the Pokemon you need and combine it with a ditto. Ditto breeds with all Pokemon unless they are unbreedable (like Legendaries) Leave the two Pokemon with the Day Care man near Azalea Town and eventually you will be called they have an egg.
u cant
For which game? Pokemon Red Pokemon Blue Pokemon Yellow Pokemon Gold Pokemon Silver Pokemon Crystal Pokemon Sapphire Pokemon Ruby Pokemon FireRed Pokemon LeafGreen Pokemon Emerald Pokemon Diamond Pokemon Pearl