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Now like bugmaniacbob did for Aurumoth, I wanted to base the weights on calculations using the densities of the matierials that are the Pokemon's namesakes. However, in looking back at his calculations, I noticed that his weight only took into account a single wing. The calculations all make sense, but looking at them, Aurumoth should clearly weight 6 times what it does. However, this could not be a case of error, as Aurumoth clearly weighs exactly what bmb said. I thought for a while, and finally arrived at this explaination:

Aurumoth uses some sort of psychic power to lessen the density of the its floating wings. While using this ability, the weight of all its plates measure the same as the weight of a single one. For its pre evolutions, this ability has not been fully developed. Cupra, who's two plates are attached to its body, carries the full mass of the copper. Argalis on the other hand, carries the full weight for the 4 acting as a shell, but has developed enough power to cause the two floating wings to only register as one when weighed.

As for the specific calculations, to start off, I looked at other Pokemon which I could possibly base these off of. I found that Tyranitar was just .1 m shorter than Aurumoth, so I decided to use it as a base. Using that, I made Argalis just taller that Pupitar, much like their evolutions, putting it at 1.3 m. Next, to decide the weight, I decided to go with a method similar to what bmb did for Aurumoth, in that I would calculate a weight for the plates, assuming they are made of their metal namesake. Looking at Argalis, I approximated its plate height as 2/3's of its total height, or 86 2/3 cm. bmb based the volume of Aurumoth's wings as bars of dimentions 100x20x5. Since I now had a new height, I decided to scale down the rest by the same amount:
86.66/100*20 = 17 1/3 cm
86.66/100*5 = 4 1/3 cm.
This puts the final volume at 86 2/3 cm x 17 1/3 cm x 4 1/3 cm = 6509.62963 cm^3. The density of silver near room temperature is 10.49 g·cm^-3. This would put the mass of the bars at 6509.62963 cm^3 * 10.49 g·cm^-3 = 68.2860148 killograms. However, there as explained above, Argalis is carrying the weight of 5 wings, so we multiply by 5 to get the final value of 341.430074 kg, which rounds to 341.4.

Moving on to Cupra, I once again based it off of the Tyranitar family, this time comparing to Larvitar. However, I imagined Cupra to be on the small side, so I decided to dip .1 m under, rather than over, putting it at .5 m. To do weight, I decided to do the same thing as before, however, with its head being more removed from the body, I aproximated the length of the shell to be 3/5 of its height, putting it at 30 cm. Once again, I did the ratios to determine the other values:
30/100*20 = 6 cm
30/100*5 = 1.5 cm
The final volume is thus 30 cm x 6 cm x 1.5 cm = 270 cm^3. The density of copper is 8.96 g·cm-3. This makes the mass of a wing 270 cm^3 * 8.96 g·cm^-3 = 2.4192 kg. Cupra has 2 wings, so the final weight would be double that or 4.8384 kg, which rounds to 4.8 kg.