Bellossom moveset ? plesssseeeee?

hiii look i have this issue my bellossomk cames from johto soo it has some moves learned when it arrived unova region she knows sludge bomb, solar beam, sunny day and MAGICAL LEAF. but this last attack i dont thionk it worth to have it due to bellossom�s potencial because her nature is modest so i�m wondering which attack does she must learn. she can�t remember any attack prior evolution and is just able to learn attacks by tm of 5th generation ( giga drain is no longer an option) sooo which attack should be tha last attack???? thanks a lot