It is confirmed that movesets are completely randomized upon evolution.
I have created a spreadsheet that lists out each Pokemon's attack set. I have also created a subjective preferred attack list for each Pokemon by using some data from game mechanics, personal experience, and subjective analysis. The spreadsheet now contains both standard attack and special attack lists.
DISCLAIMER: All data is taken from Serebii, which is still incomplete. There may be missing data in the spreadsheet that can affect the preferred attack list, as well as errors in data.
The preferred attack list is only a subjective list of attacks. Use your own judgement and experience.
Due to dodging mechanics, in my opinion, standard attacks are far more valuable than special attacks which take too long to recover from.
Attack speed, type advantage, and other determining factors are taken into account. However because the mechanics on Pokemon CP, HP, defense, and attack levels are still unknown, analyses will certainly change over time.
