Hello there!

[Dragonstrike]

I suppose it's best possible option, though it has a bad side.
If this won't suit me i'll just change it to other pokemon. About the moveset, is Rest a good idea or should i use this slot for something different?

Yeah, but that's what happens when ya have pokemon with gimmick abilities that purposely weaken them.

Rest might be a good idea.  I don't think Lazy overrides Rest's sleep turns.  The main problem is you do nothing if Sleep Talk selects Rest, so you have to be careful of that.  Could definitely work on bulkier sets, though, and help ease Sleep Talk predictions if Feliger is already asleep from Rest when it switches in (meaning you'd know how long it'll be asleep for since Lazy wouldn't activate)