The Gyarados' art is a bit more detailed on Misty's card, but Giovanni's version loses out based on the trainer, as the artwork for each card is exceptional
A player looking for those cards may want to buy them all at once to cut back on shipping costs
Keith is a godsend, but he is one man
According to the manual, Power is achieved by strong monsters bringing a "quick and decisive victory," and Technique is "withstood an opponent's attacks to the limits of your Life Points by effectively using Defense and Trap/Magic Cards." If these conditions sound vague, it's because they are, and unless you're okay with more trial-and-error, you'll need to look that up too
Ping your opponent with a flying infect creature like Viral Drake to get the ball rolling on poison counters so you can then attack with Chained Throatseeker for more infect damage
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