Yes, that's right. As Pokemon Connoisseurs, we taste them--not literally, mind you, that would just be silly--by observing them and their interactions with other Pokemon and humans. By judging the bond that a Trainer and their Pokemon might have, we can determine what quality of life the Pokemon has and whether or not it needs to be improved upon, in which case we do our best to advise the Trainer on how to better care for them.

[In other words, his use of "taste" here is just a figure of speech.]