Watch Diary of a Wimpy Kid (2010) HD Full Movie Free on SolarMovie. Watch Diary of a Wimpy Kid (2010) online free. Greg Heffley is a 12 year old who is fresh out of elementary and transitions to middle school, where...Greg Heffley is a 12 year old who is fresh out of elementary and transitions to middle school, where he has to learn the consequences and responsibility to survive the year.