One of the most common grammatical errors I have encountered is the use of apostrophes. OHKO'ed, OHKO'd and OHKO's are never correct. The proper construction would be "OHKOed" and "OHKOs". There is no need for an apostrophe there because no letters have been left out (it's not a contraction) and it's not possessive (the only time 's is used).
, a Pokemon AI.
"Strategy without tactics is the slowest route to victory. Tactics without strategy is the noise before defeat." - Sun Tzu