How it works is that you co-link monsters from the one Extra Monster Zone to the other Extra Monster Zone, forming what looks like a necklace
After you have one in each Pendulum Zone, once per turn during your Main Phase, declare that youre Pendulum Summoning
Something else interesting to look at is the contents of his Side Deck
Note: This guide is still being updated
In fairness, this is a decent deck with some good spellcasters and some pretty decent support, but you should have enough top tier decks that it shouldn't be too much of a problem for you
Our experience was that, for making the cards graphic design, these tools allow you to generate any layout you may want, with unlimited flexibility and with all the benefits of using a professional tool like Photoshop: what could go wrong?