New Super Luigi U Walkthrough Part 13: Muk Was Here! Hoppip is a Loser!

Muk's Pokemon Ruby Pokedex entry:
From Muk's body seeps a foul fluid that gives off a nose-bendingly horrible stench. Just one drop of this Pokémon's body fluid can turn a pool stagnant and rancid.

That might explain why this jungle is so polluted.

Side note: I tweaked some video settings on the game footage to see if I can up the quality a tad more. I don't know if you'll notice much of a difference though, but I'm aiming to get it the best I can with the equipment I have.

Time Stamps:
0:17 Soda Jungle-7: Wiggler Floodlands
3:53 Soda Jungle-Castle: Iggy's Swinging-Chains Castle

7:40 Rock-Candy Mines-1: Mount Fuzzy
11:18 Rock-Candy Mines-2: Porcupuffer Cavern

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My deviantART: http://www.pkgam.deviantart.com
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Enjoy!