Well, look at Amoonguss' stats. Both it's Atk and SpAtk are the same. But, for competitive, use it as a status inflicter/staller. Amoonguss has a wide range of Status moves, such as spore, toxic, Synthesis...
Stat Range
At Lv. 50 At Lv. 100
HP: 114
174 - 221 338 - 432
Attack: 85
81 - 150...