I love Dialga. His cry is ADORABLE. He’s a dragon that can control time itself, but he makes a squealing sound. This is most noticeable when being petted (Gen 6 & 7) or romping around with other Pokémon (Gen 8 Pokémon Camp). Also, Dialga’s shiny is turquoise, which is the greatest color on the planet.
Dialga (I had a hard time choosing between the 3. All of them are nearly equally cool, but Dialga, the Time Dragon had to win for me.) > Giratina (Distortion World A.K.A. Let's-Flex-What-A-Nintendo-DS-Can-Do World was really fun! Also, Ghost-Type is my favorite type!) > Palkia > (The space dragon lost here, but I still love it! )