In the Orange Islands, Moltres, the titan of fire; Zapdos, the titan of lightning; and Articuno, the titan of ice, maintain a delicate balance of power with nature. It is said that if that balance is disturbed, the legendary Pokemon Lugia will rise from the depths of the ocean to help keep the peace. It is this legend that calls a rare Pokemon hunter to the islands; he seeks to capture the titans – and thus, Lugia itself – and he will stop at nothing to do so. Meanwhile, Ash, Misty and Tracey have arrived at the islands and end up becoming mysteriously shipwrecked on Shambouti Island – a place where an annual festival honoring the titans has just begun. Ash accepts the role of the ceremonial "Chosen One" who will find three orbs to represent the harmony between the titans; but thanks to the battle that now rages in the skies, he soon discovers that the ceremony he must take part in will have very real ramifications!
After Momoka gives Fuyuki a strange creature in a jar, the Keroro Platoon and friends head to a South Pacific island for a holiday; but on the first night there, the group is attacked by giant sea creatures that kidnap Natsumi! When she regains consciousness, Natsumi is greeted by two aliens: Maru, a female, and Meru, a male who makes Natsumi his princess and creates a deep-sea world from her memories. Meanwhile, Keroro and the others must now figure out who these two aliens are, think of a way to rescue Natsumi, and perhaps save the world from flooding whilst they’re at it!
Both movies are based on children's shows and have a plot that's like a really long episode of the TV series. If you like one you should watch the other.
Note: this recommendation is for all the pokémon movies, not just the second one.
With the help of the power of the Pharaoh, Yugi Moto has earned the reputation of being the “King of Games.” But Seto Kaiba finally has a plan to bring down his rival, and with his new and powerful cards, he might finally have a chance of succeeding. Meanwhile, a new artifact known as the Pyramid of Light has captured the attention of Yugi and the gang, as it bears a striking resemblance to the Millennium Puzzle. Soon, Seto and Yugi will face each other in an epic battle – but something mysterious is at work. Will Yugi, the Pharaoh’s wistful strategies and the Egyptian God Cards be enough to put a stop to the ultimate foe?
I think that if you enjoyed one, you will probably enjoy the other. Both are anime that were popular around the same time and i don't know why but i feel that this pair just works together. So yeah, give it a try if you haven't seen it yet.