You can certainly pick off small creatures with just one toughness with Kelsien, but if you want to start taking care of larger creatures, you're going to need to give him deathtouch
In Play Boosters, you can find 30 tokens and 1 plot helper card across three card sets, with 18 tokens and the plot helper card from Outlaws of Thunder Junction (OTJ), 7 tokens from The Big Score (BIG), and 5 tokens from Breaking News (OTP)
Temperatures for other materials will vary depending on the type of material used
Once a Pokemon becomes confused, it remains that way until it is either knocked out, retreats, or has the Confused marker removed
Hes not really a fighter, so thats not what this card is best used for
But at only 1-cost, you are probably okay with it taking hits from more expensive cards