I suggest you change some moves because some moves you use right now are not very useful. Also consider changing some pokemon as a whole, seeing as you lack some important type resists such as water, fire and flying. I'd get rid of Shuckle and add in a water-type (Empoleon, Suicune, Starmie, Swampert, Vaporeon are all good options). As for move changes:Can anybody tell me if this team is good for 4th Gen?
;242; Bold Blissey (leftovers)
;205; Modest Forretress (Leftovers)
;213; Lonely Shuckle (King's Rock)
;065; Modest Alakazam (Focus Sash)
;291; Hardy Ninjask w/Speed Boost (Focus Sash)
;442; Spiritomb w/Wonder Guard (Leftovers)
Blissey: toxic>psychic and seismic toss>ice beam
Forretress: gyro ball>waterfall
Shuckle: pretty sure it can't learn trick room, as I said it is best to replace shuckle as a whole.
Alakazam: focus blast>recover
Ninjask: substitute>earthquake and x-scissor>bug buzz
Spiritomb: Wonder Guard is (unfortunately lol) not a legal ability on spiritomb. Also, sucker punch>ice beam.
The team can be decent once these changes have been made. Hope this helped.