Furfrou is a highly valued Pokémon and especially sought after in Pokémon HOME. It is very common to see users willing to trade Legendary Pokémon and Shinys for a Furfrou with hard-to-get trims like Pharoah. These styles can only be obtained by using the Change Form option within the Pokémon's details menu.
You can't change it's form after transferring it, so yes, change it before you transfer it. Heart Shiny Furfrou is one of the rarest but if you have Pharaoh or LA Rein, you might consider them too. I imagine the Heart form will go away after Valentines Day like it did last year.
Currently Furfrou forms are only obtainable in Gen VI and VII games, but any Furfrou put into Bank is immediately reverted to natural form. The only way to get Furfrou in Home with any other form is to transfer it from GO, but Heart Trim specifically is currently unavailable in GO.
If you want to unlock the premium styles (La Reine, Kabuki, and Pharaoh) you must have them groom your Furfrou at least once with the Heart Trim, Diamond Trim, and the Star Trim, then the next time you talk to the clerk, you will have unlocked the following styles: La Reine, Kabuki, and Pharaoh.
You can't change it's form after transferring it, so yes, change it before you transfer it. Heart Shiny Furfrou is one of the rarest but if you have Pharaoh or LA Rein, you might consider them too. I imagine the Heart form will go away after Valentines Day like it did last year.
Which is the best Furfrou form? Furfrou's forms are only an aesthetic change with no impact on stats or gameplay. That means you can pick whichever Trim you prefer since none will put you at an actual advantage or disadvantage.
It's likely the rarest cuts are the three relegated to specific countries: France, Japan, and Egypt. If you're in France, you'll get the La Reine trim (blue), Japan gets the Kabuki trim (red), and Egypt gets the Pharoah trim (dark blue).
Furfrou is a highly valued Pokémon and especially sought after in Pokémon HOME. It is very common to see users willing to trade Legendary Pokémon and Shinys for a Furfrou with hard-to-get trims like Pharoah. These styles can only be obtained by using the Change Form option within the Pokémon's details menu.
How to Change Pokemon Go Furfrou Forms. Swapping between Furfrou Forms requires 25 Furfrou Candy and 10,000 Stardust. Select the Furfrou that you wish to trim, and you'll see a Change Form button under the Power Up button. Select the desired Furfrou Form from the menu, and then click the Change Form button underneath.
Pokemon GO: How To Get Heart Furfrou Tap on Furfrou's summary in the Pokemon Storage. Tap the Change Form button, and a new list with available options emerges. There are multiple Trims, but one must navigate to the Heart Furfrou. Changing Furfrou's trims in Pokemon GO costs 25 Candy and 10000 Stardust.