I ordered up trump from the dealer of the opposing team and the same person said they were going alone and asked for their partners best card. Is that legal in the euchre rules?
If the player who fixes the trump suit believes it will be to his side's advantage to play without the help of his partner's cards, the player exercises this option by declaring "alone" distinctly at the time of making the trump. This player's partner then turns his cards face down and does not participate in the play.
The player, who chooses the trump suit, either by accepting the up-card's suit as trump, or by naming a different suit, is called the maker. Before the play of the hand begins, the maker may announce; "Alone", in which case the maker's partner places his hand facedown and does not participate in the play.
Note that both these Rule compilations do not include your House Rule of a card being passed from maker's partner to the maker.
First it depends what euchre you are playing such as railroad, bid euchre or sometimes by house rules. In regular euchre you don't ask for your partners best but you can go alone against if those are the house rules. A similar situation is if the opponent reneges on a lone hand the maker gets his lone hand( not the usual 2 ) otherwise people would just renege, but also if the maker reneges on his lone hand the other team gets 4 points. It states quite clearly who ever reneges the opposing team gets the 4 points this makes sense to me because the rules do not say if the dealers reneges so I would assume it means who ever renges on loan hand the other team gets the point.) Now on a go alone against its the team that gets at least 3 tricks that gets the 4 points, Remember these are house rules or different games of euchre not regular euchre but some may adopt these rules as house rules.
There are many variations to the rules of Euchre. In most tournaments I have played we play Stick the Dealer" Euchre. That is where, after 7 Passes, the Dealer MUST Name Trump. Also, there is no passing of cards from one player to their partner or anyone else for any reason. Also, no one can OVERBID or change the bid or change who will play the hand once a bid is announced. The best you an do is Euchre someone if you have a better hand play it better than they do. If a Bid is announced in error, that player must play the hand in that Suit. If a card is played in error, that card is in play and can not be taken back off the table unless it is an accidental renege. Then it can be set aside but left on the table until it is the correct time to play it and it must be played when that time comes, no matter how ill advised that play is. If someone reneges and does not correct his error, then that team is penalized. If the error was made by the Makers, then 2 points is awarded to the Defenders. If the error is made by the Defenders, then 2 points (4 points during a Loner) is awarded. Stealing The Deal is NOT a rule in Tournament Games but some play that way in general play. I personally do not do that but I do play with some people who do. I tolerate them because I like to play and winning is simply one of the many benefits I derive from the game. I must admit, I have Stolen the Deal more than once myself. No one likes to make mistakes but it happens. Being kind and understanding while obeying the rules is always a good idea. Everyone makes mistakes eventually and being kind is good karma in my book.