470 Leafeon

Razor Leaf and Bullet Seed are almost polar opposites of each other. The former features very high raw damage with STAB, while the latter offers neutral below-average damage for much higher energy gains. Quick Attack lacks STAB and can't be Super Effective against anything. 

Leaf Blade is Leafeon's best charge move, as it gets STAB, costs low amounts of energy, and has a high 2.0 DPE (Damage Per Energy). It's also superior to all of Leafeon's other Grass-type charge moves. Last Resort is recommended as the second choice due to it providing neutral coverage. 

Leafeon is an interesting candidate for Great League, featuring a mono-Grass typing and overall decent stats. While a high defense stat does suggest it has bulk, this is somewhat compromised by its lower stamina stat. While the addition of Last Resort does provide neutral coverage, the relatively high energy cost makes it difficult to access without sacrificing the powerful damage output of Razor Leaf. Overall Leafeon can do the job of what a Grass-type should do, but other Grass can do it way better while offering much more in terms of coverage or utility. 

Leafeon performs similarly in Ultra League compared to Great League. What's interesting in this league is that Leafeon actually ties with Snorlax depending on shielding, but loses to its other mono-Grass counterpart, Meganium. Leafeon's wins against almost every Water-type in this league is definitely a plus, but maybe consider Meganium for its access to a stronger coverage move. 

With a max CP of 2944 Leafeon falls behind in stats to compete well with the legendaries in Master League. Thanks to the CP cap being removed in this league, Leafeon is able to take revenge for its loss against Meganium in Ultra League, and interestingly enough is still capable of beating most Pokemon that have a weakness to Grass, including Groudon and Kyogre. Despite this, inadequate stats and little coverage makes other options more considerable for this league.