There is often confusion between the 2014 series and the original 2009 series.
As the fight progresses, Natsu eventually finds a way to turn the tide by interacting with the fire dragon, Atlas Flame, though this climax primarily develops in the following episode. Important Note on Episode Numbering Fairy Tail (2014) Episode 19
Titled "Changeling," this is a popular "filler" episode where the guild members accidentally switch bodies due to an ancient spell. There is often confusion between the 2014 series
Natsu is still locked in a desperate battle against Future Rogue, who is controlling the dragons to facilitate his plan for world domination. Natsu is still locked in a desperate battle
Titled "Zirconis' Magic," this is a "canon" episode (Episode 194 overall) that is part of the major Eclipse Gate storyline.
The dragon Zirconis uses his unique magic to literally strip the "dignity" (clothing) off the soldiers and wizards, including Lucy and Wendy, creating chaotic and comedic scenes amidst the serious war.