In the Tentacool and Tentacruel episode. The old lady had bombs, rocket launchers and auto-machine guns. Oh, and the Squirtle squad episode where the western store had a horde of people point machine guns at Ash and he even mentions guns in the dialogue to get the point across. But they don't show the Dratini episode that had ONE gun in it. Seems legit, guys.
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There's also that episode when Ash found a Pokeball with a Dratini contained, and the owner pulled a gun out on Ash's head.
To quite a YT video I watched once regarding that Episode
"Now Team Rocket has Guns and Meowth is Hitler" I couldn't stop laughing lol.
They really like giving Meowth the Hitler stache. I believe there are DP episodes and maybe even BW episodes with it. Tough to be fair I see it in a lot of other anime too. Maybe it's a trendy thing in Japan?