I read that Sunkern was weaker, but it has a better movepool, not sure if that's true.
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(Pardon my spelling mistakes) The Only Pokemon that can learn splash is Magikarp, Gyardos (if you didn't make it forget splash when it was Magikarp). The other two I THINK is Feebas And Milotic (Milotic's reason is exactly the same as Gyardos. Hope this helped! :)
put strong Pokemon on your team and a magikarp. put magikarp first, and go to a place with high level Pokemon. when you meet a wild Pokemon, switch your Pokemon with a high level Pokemon and make it faint. that way, your magikarp will gain 1/2 experience. the other way is to put on experience share(it is an item)
The tiles are random every day. There are four, and the only to see which is by fishing each individual tile. The best choice is the Old Rod, as with that, Feebas will appear half of the time on the right tiles, the other half being Magikarp. If you mix records with a friend, your tiles will be the same, and you can work together to catch one.
Level20, As it always does in every other Pokemon Game.
A golden Margikarp is a shiny margikarp, and as with other shiny Pokemon, there is only a 1/1892 chance of getting a Shiny(golden) magikarp. Breeding a Shiny Gyarados or a Shiny margikarp with another shiny Pokemon THAT CAN BREED WITH GYARADOS/MARGIKARP may have a higher chance of breeding a shiny magikarp. You can also trade the shiny gyarados from Pokemon Gold, Silver, and Crystal version.