Dont' say no to Lechonk. Best case scenario, it becomes an important member of your team and assist you in winning the Pokémon League. Worst case scenario, it evolves into thisLechonk - I'm pretty indifferent to the thing itself, but if I were to express my feelings towards all the adoration for its name, it would be 10 hours of histrionics about how Grumpig keeps getting neglected.
Hold on to Lechonk. It's a win-win.