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Leafeon's offensive movepool is somewhat shallow, and it has a mediocre offensive typing in pure Grass, often leaving Leafeon dependent on neutral coverage to pick up KOs. This leads to Leafeon struggling to break through certain bulky Pokemon, such as Weezing and Ferroseed. Furthermore, while it can break through Pokemon such as Weezing with its Z-Move, this means it also takes up the team's dedicated Z-Move slot. It can also be relatively easily worn down through means such as Double-Edge's recoil. While its Speed is decent, it is not the best when the sun is not up, so Leafeon can still be relatively easily outsped and revenge killed by Pokemon such as Swanna and Pyroar, especially with its poor HP, lacking Special Defense, and bad defensive typing. Leafeon receives a good amount of competition from other Grass-types both inside and out of sun, such as Shiftry and Sawsbuck. Both have secondary STAB moves and more coverage options, and Shiftry also has access to Sucker Punch and a good support movepool with moves such as Defog.
Furthermore, the only reason to use Glaceon over the otherwise superior Aurorus is its access to Z-Celebrate, which is a mediocre set due to Glaceon's poor defensive typing that gives it a hard time setting up, its shallow movepool, and the move's one-time-use nature. It also is easily revenge killed by the likes of Choice Scarf Primeape and Kabutops and is unable to deal significant damage to threats like Articuno and Lanturn, leaving it easily taken care of.
