hardest pokemon to get

[lilharper]

i just caught Ho-oh on heart gold without the master ball mrgreen  

[Vriska Serket]

beldum, the thing has a 3% catch rate and the only attack they know is take down. It took me upwards of 20 encounters with them, (each encounter ending with it killing itself) before I could catch one in a timer ball.  

[lilharper]

sleep helps with that  

[YukiSukiChan]

Beldum. And once on a rare occasion, rattata. It's a very embarassing story  

[Mimi Kyashi 19]

For some reason, if a Pokemon is too easy to catch, I don't like them. o.0 Like easy pidgey vs hard pidgey. Even if the other one has a higher level, I'd still pick the hard one.  

[NejiHyuga900]

Getting a Mew in RBY is impossible (without a GameShark).

All the Level 70 Legendary Pokémon that I would encounter would be hard to capture.