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Question

UPDATE: To make this puzzle fairer, the pieces have been modified to include additional hints. If you want to try and solve the puzzle with the original non-clued pieces, click here.

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A tale is being told here, one that spans many years and generations... but what kind of tale might it be?

Pastebin link to a transcript of the clues, including colorblind assistance. Note that Y = Yellow, B = Black/Gray, R = Red, W = White

Click here for a copy of the pieces without the highlighted squares

The answer is a five-letter word.

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Hint 1:

This puzzle was posted on February 27, 2021.

Hint 2:

No rotation of the pieces is necessary. When constructed properly, the assembled figure should fit snugly within a 17x17 grid.

Hint 3:

Let's not get ahead of ourselves here: this tail... I mean, tale, may seem to be quite electric, but there's something else that we can describe it as.

Answer 1

Clue answers:

From the clues, we can surmise that

the puzzle is Pokémon themed: several clues are direct references to it. The yellow and black, with a bit of red, suggests Pikachu's color scheme -- so the goal here is to assemble Pikachu from these pieces.

Assembly is hard at first (especially because some of the clues are ambiguous, and you'll have to figure out the answers as you go). But putting the red pieces together gives a start:

And a bit of intuition about what can go where (and experimentation with a few possibilities) led me here:

And now there's a way to more confidently assemble the grid! Part of a message has appeared:

In the yellow squares we have [g]ROUND [??]G WATE[r] DARK - these are all Pokémon types!

So, assembling the pieces (and correcting some errors) gives a final image:

And this has all the Pokémon types, except for one: FAIRY, which is the answer to the puzzle (and the type of tale this is!)

Answer 2

Clues (Almost Complete)

Thanks to @Deusovi (bold, in the chatroom) and @Stiv (italics, in the comments) for some of these answers, and for noticing that the answers should be...

...in alphabetical order!
Notes/Thoughts
*In Big Stadium in Nimbasa City, Ace Trainer Charlie has a Galvantula, and "Charlie's" fits alphabetically
**A Stradivarius is a type of violin, and violins don't have frets
***Technically the Pokémon's name is "Magnemite", but since "magnem" isn't a word, I think the intended word is "magnet"

Theme

The theme of this question is Pokémon for a few reasons. There are a lot of references to it in the clues/answers: Galvantula, Frufrou, Focus Blast, leaving with 1HP, Magnemite/Magneton, Nitro/Flame Charge, Spatial Rend, Farfetch'd, sprite. February 27 (emphasized by Hint 1) is Pokémon Day and the Pokémon franchise spans multiple years and generations! Not sure what kind of tale is being told though.... The colour scheme also resembles Pikachu's, which is relevant in the next section.

Next Steps

Obviously the rest of the clues need to be filled in. @Deusovi mentioned in the chatroom that the goal of the puzzle is to construct Pikachu using the pieces (without rotating them; notice the square pieces in different orientations). However, there isn't a piece long enough without rotating to cover the four cells "sticking out" in the eight-letter clue, so I think rotating might be necessary.
@Stiv had a similar idea in the comments, but wondered if the pieces, either when laid on the grid or when rearranged, would spell out the names of Pokémon (the "lax" in "relaxes" is remiscient of "Snorlax"). Taking a look at the four-letter Pokémon (Abra, Aron, Axew, Jynx, Natu, Onix, Sawk, Seel, Snom, Uxie, and Xatu, if you want to cross-check) with the I-tetromino, I couldn't find any possible matches, so if this is the case, it is probably post-rearranging.