try evenin out ur pokemonz lvls for a start, usin ya starter pokemon to much can leave u hopeless.
TRY to train up all your pokemon up to lv. 70.
when i beat cynthia i barley made it through at all,
meganium, lv 59, 172 HP, body slam+synthesis+magical leaf+petal dance.
dragonite, lv 59, 188 HP, aqua tail+fly+dragon rush+rock smash.
lugia, lv 59, 201 HP, defog+waterfall+roost+avalanche.
feraligatr, lv 62, 183 HP, cut+strength+surf+ice fang.
typhlosion, lv 63, 181 HP, rock climb+double-edge+flamethrower+eruoption.
infernape, lv 78, 229 HP, flamethrower+fire blast+flare blitz+focus punch.