I feel the urge to add this.
Yes, Explosion is the most powerful at 250. However...
Lickilicky is the only Normal-type Pokemon that can learn Explosion. Since Explosion is a Normal-type move, it will get STAB. And if Lickilicky holds a Silk Scarf, it will raise by a fifth.
So, in this case it is Explosion, but Explosion is a lot more powerful if this combo is used.
Hope I helped. :)
Source: Some video I will link to later on.