You need an elementary course in the English language and the meaning of words. And here we go, mate:
good
adjective
adjective: good; comparative adjective: better; superlative adjective: best
1.
to be desired or approved of.
"we live at peace with each other, which is good"
synonyms: healthy, fine, sound, tip-top, hale and hearty, fit, robust, sturdy, strong, vigorous
en·e·my
noun
noun: enemy; plural noun: enemies
1.
a person who is actively opposed or hostile to someone or something.
synonyms: opponent, adversary, foe, archenemy, rival, antagonist, combatant, challenger, competitor, opposer;
the opposition, the competition, the other side, the opposing side
"he and his brother have been enemies for years"
"Best" is superlative of "good" and therefore could not possibly be construed as opposite or competitor. Case closed.